{
 "generated_utc": "2026-09-24T17:27:43Z",
 "gfs_cycle_utc": "2026-09-24T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 461.5,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260924_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260924_12Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 211068
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 15:38:41",
   "seed_lat": 44.43746,
   "seed_lon": -30.29163,
   "seed_alt_m": 13470.0,
   "seed_age_h": 25.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 44.61401,
    "lon": 95.99486,
    "alt_m": 13215.0
   },
   "member_spread_deg": {
    "lat": 15.2,
    "lon": 100.69
   },
   "member_spread_now_deg": {
    "lat": 5.23,
    "lon": 10.53
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 14:25:00",
   "seed_lat": 54.93747,
   "seed_lon": -7.12495,
   "seed_alt_m": 13260.0,
   "seed_age_h": 2.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 14:00:00",
    "lat": 43.45223,
    "lon": 101.72921,
    "alt_m": 13155.5
   },
   "member_spread_deg": {
    "lat": 13.42,
    "lon": 121.83
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 1.96
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 06:33:40",
   "seed_lat": -67.875,
   "seed_lon": 100.87501,
   "seed_alt_m": 12210.0,
   "seed_age_h": 10.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": -76.35755,
    "lon": 109.76037,
    "alt_m": 12290.3
   },
   "member_spread_deg": {
    "lat": 24.36,
    "lon": 82.26
   },
   "member_spread_now_deg": {
    "lat": 7.5,
    "lon": 0.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AIRCOR-6",
   "flight_id": "AIRCOR-6_2026-09-14",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 15:39:13",
   "seed_lat": 40.33008,
   "seed_lon": -104.83542,
   "seed_alt_m": 15554.0,
   "seed_age_h": 25.68,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 19.82771,
    "lon": -59.70937,
    "alt_m": 15829.3
   },
   "member_spread_deg": {
    "lat": 23.55,
    "lon": 92.64
   },
   "member_spread_now_deg": {
    "lat": 13.14,
    "lon": 13.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 06:10:48",
   "seed_lat": 26.70833,
   "seed_lon": 166.125,
   "seed_alt_m": 13790.0,
   "seed_age_h": 11.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 20.39065,
    "lon": -89.88706,
    "alt_m": 13847.8
   },
   "member_spread_deg": {
    "lat": 29.65,
    "lon": 55.54
   },
   "member_spread_now_deg": {
    "lat": 2.37,
    "lon": 1.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:18:48",
   "seed_lat": 49.5,
   "seed_lon": -108.0,
   "seed_alt_m": 13160.0,
   "seed_age_h": 1.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 15:45:00",
    "lat": 40.90719,
    "lon": 50.07274,
    "alt_m": 13168.2
   },
   "member_spread_deg": {
    "lat": 18.18,
    "lon": 37.06
   },
   "member_spread_now_deg": {
    "lat": 0.44,
    "lon": 0.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 10:39:47",
   "seed_lat": 44.625,
   "seed_lon": 92.58333,
   "seed_alt_m": 13790.0,
   "seed_age_h": 6.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 51.37497,
    "lon": -33.64536,
    "alt_m": 13572.0
   },
   "member_spread_deg": {
    "lat": 25.18,
    "lon": 121.12
   },
   "member_spread_now_deg": {
    "lat": 0.6,
    "lon": 1.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BZ-7",
   "flight_id": "BZ-7_2026-08-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 07:29:00",
   "seed_lat": 31.91667,
   "seed_lon": 0.95833,
   "seed_alt_m": 11580.0,
   "seed_age_h": 105.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 49.88433,
    "lon": -129.50966,
    "alt_m": 11261.5
   },
   "member_spread_deg": {
    "lat": 52.48,
    "lon": 263.1
   },
   "member_spread_now_deg": {
    "lat": 21.07,
    "lon": 83.43
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:54:01",
   "seed_lat": 50.22917,
   "seed_lon": -104.125,
   "seed_alt_m": 12390.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:00:00",
    "lat": 38.92735,
    "lon": 20.41949,
    "alt_m": 12319.9
   },
   "member_spread_deg": {
    "lat": 31.89,
    "lon": 57.09
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 0.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:55:32",
   "seed_lat": 50.23429,
   "seed_lon": -104.12952,
   "seed_alt_m": 12390.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:00:00",
    "lat": 38.89148,
    "lon": 20.48208,
    "alt_m": 12319.8
   },
   "member_spread_deg": {
    "lat": 32.4,
    "lon": 57.17
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 0.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 13:21:00",
   "seed_lat": 40.22917,
   "seed_lon": 25.54167,
   "seed_alt_m": 12550.0,
   "seed_age_h": 27.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 36.69751,
    "lon": -178.09242,
    "alt_m": 12980.3
   },
   "member_spread_deg": {
    "lat": 19.75,
    "lon": 335.65
   },
   "member_spread_now_deg": {
    "lat": 7.61,
    "lon": 11.73
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 02:12:00",
   "seed_lat": 49.75,
   "seed_lon": -175.875,
   "seed_alt_m": 12820.0,
   "seed_age_h": 15.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 30.02221,
    "lon": -56.61953,
    "alt_m": 13663.6
   },
   "member_spread_deg": {
    "lat": 65.98,
    "lon": 131.63
   },
   "member_spread_now_deg": {
    "lat": 12.99,
    "lon": 17.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:36:00",
   "seed_lat": 52.60417,
   "seed_lon": -179.04167,
   "seed_alt_m": 12990.0,
   "seed_age_h": 16.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 56.95986,
    "lon": 40.36766,
    "alt_m": 13495.1
   },
   "member_spread_deg": {
    "lat": 30.46,
    "lon": 78.66
   },
   "member_spread_now_deg": {
    "lat": 8.53,
    "lon": 6.86
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 04:35:00",
   "seed_lat": 21.41667,
   "seed_lon": 161.0,
   "seed_alt_m": 13500.0,
   "seed_age_h": 12.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 33.78354,
    "lon": -130.24422,
    "alt_m": 13608.7
   },
   "member_spread_deg": {
    "lat": 16.12,
    "lon": 298.11
   },
   "member_spread_now_deg": {
    "lat": 3.54,
    "lon": 2.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-44",
   "flight_id": "DO3GU-44_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 13:18:43",
   "seed_lat": 35.89583,
   "seed_lon": -76.25,
   "seed_alt_m": 15219.0,
   "seed_age_h": 148.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 1.06863,
    "lon": -37.64916,
    "alt_m": 15312.9
   },
   "member_spread_deg": {
    "lat": 49.72,
    "lon": 199.3
   },
   "member_spread_now_deg": {
    "lat": 49.57,
    "lon": 74.66
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-48",
   "flight_id": "DO3GU-48_2026-09-08",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 07:36:22",
   "seed_lat": 68.0,
   "seed_lon": 83.29167,
   "seed_alt_m": 14417.0,
   "seed_age_h": 153.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 67.60971,
    "lon": -12.09572,
    "alt_m": 14198.1
   },
   "member_spread_deg": {
    "lat": 14.59,
    "lon": 53.76
   },
   "member_spread_now_deg": {
    "lat": 12.19,
    "lon": 347.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-49",
   "flight_id": "DO3GU-49_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-19 12:40:28",
   "seed_lat": 39.83333,
   "seed_lon": 60.66667,
   "seed_alt_m": 13990.0,
   "seed_age_h": 124.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 39.69748,
    "lon": -61.00676,
    "alt_m": 13903.6
   },
   "member_spread_deg": {
    "lat": 43.31,
    "lon": 325.29
   },
   "member_spread_now_deg": {
    "lat": 35.48,
    "lon": 341.12
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-24 02:46:08",
   "seed_lat": 45.11771,
   "seed_lon": 143.63833,
   "seed_alt_m": 13946.0,
   "seed_age_h": 14.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 55.03896,
    "lon": -8.01776,
    "alt_m": 13686.3
   },
   "member_spread_deg": {
    "lat": 28.9,
    "lon": 97.23
   },
   "member_spread_now_deg": {
    "lat": 0.8,
    "lon": 14.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:48:00",
   "seed_lat": 40.875,
   "seed_lon": -24.91667,
   "seed_alt_m": 13600.0,
   "seed_age_h": 0.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 16:15:00",
    "lat": 41.97538,
    "lon": 61.70294,
    "alt_m": 13206.2
   },
   "member_spread_deg": {
    "lat": 13.57,
    "lon": 55.01
   },
   "member_spread_now_deg": {
    "lat": 0.21,
    "lon": 0.03
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-15 23:15:47",
   "seed_lat": 26.64583,
   "seed_lon": -149.20833,
   "seed_alt_m": 13760.0,
   "seed_age_h": 210.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 32.33802,
    "lon": 56.73651,
    "alt_m": 13730.7
   },
   "member_spread_deg": {
    "lat": 39.39,
    "lon": 223.1
   },
   "member_spread_now_deg": {
    "lat": 51.77,
    "lon": 102.46
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:55:43",
   "seed_lat": 47.10411,
   "seed_lon": 148.79169,
   "seed_alt_m": 13000.0,
   "seed_age_h": 108.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 59.43751,
    "lon": 23.66084,
    "alt_m": 13229.0
   },
   "member_spread_deg": {
    "lat": 38.01,
    "lon": 114.84
   },
   "member_spread_now_deg": {
    "lat": 17.75,
    "lon": 49.87
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-09-12 06:05:00",
   "seed_lat": 45.47917,
   "seed_lon": 159.375,
   "seed_alt_m": 12660.0,
   "seed_age_h": 299.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 50.05996,
    "lon": -64.18139,
    "alt_m": 12714.0
   },
   "member_spread_deg": {
    "lat": 44.48,
    "lon": 307.14
   },
   "member_spread_now_deg": {
    "lat": 39.02,
    "lon": 200.27
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-13 13:01:00",
   "seed_lat": 42.0625,
   "seed_lon": 28.04167,
   "seed_alt_m": 12700.0,
   "seed_age_h": 268.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 52.33824,
    "lon": 84.05937,
    "alt_m": 12327.2
   },
   "member_spread_deg": {
    "lat": 17.06,
    "lon": 200.86
   },
   "member_spread_now_deg": {
    "lat": 32.49,
    "lon": 184.0
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:50:45",
   "seed_lat": 68.68745,
   "seed_lon": -107.66665,
   "seed_alt_m": 12780.0,
   "seed_age_h": 0.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 16:15:00",
    "lat": 61.11029,
    "lon": 63.23709,
    "alt_m": 13075.4
   },
   "member_spread_deg": {
    "lat": 36.56,
    "lon": 317.74
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.08
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-13 11:22:57",
   "seed_lat": 73.68216,
   "seed_lon": 37.14858,
   "seed_alt_m": 12487.0,
   "seed_age_h": 269.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 51.14541,
    "lon": 116.88688,
    "alt_m": 12238.9
   },
   "member_spread_deg": {
    "lat": 42.03,
    "lon": 282.98
   },
   "member_spread_now_deg": {
    "lat": 18.94,
    "lon": 318.54
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KM6BWB-1",
   "flight_id": "KM6BWB-1_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:13:25",
   "seed_lat": 24.70828,
   "seed_lon": -24.99995,
   "seed_alt_m": 12930.0,
   "seed_age_h": 1.11,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 15:45:00",
    "lat": 40.65052,
    "lon": 90.07644,
    "alt_m": 12799.4
   },
   "member_spread_deg": {
    "lat": 13.46,
    "lon": 83.96
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KO4VAQ-1",
   "flight_id": "KO4VAQ-1_2026-09-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:53:25",
   "seed_lat": 43.20828,
   "seed_lon": -91.04165,
   "seed_alt_m": 13120.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:00:00",
    "lat": 26.50918,
    "lon": -37.16652,
    "alt_m": 13197.7
   },
   "member_spread_deg": {
    "lat": 12.78,
    "lon": 95.83
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KS4VA-27",
   "flight_id": "KS4VA-27_2026-08-29",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 17:01:27",
   "seed_lat": 22.39578,
   "seed_lon": 15.66669,
   "seed_alt_m": 15250.0,
   "seed_age_h": 96.31,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 10.48272,
    "lon": 94.10432,
    "alt_m": 15395.1
   },
   "member_spread_deg": {
    "lat": 42.95,
    "lon": 339.97
   },
   "member_spread_now_deg": {
    "lat": 12.19,
    "lon": 28.53
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 02:23:19",
   "seed_lat": 52.72912,
   "seed_lon": -175.20831,
   "seed_alt_m": 13840.0,
   "seed_age_h": 38.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 31.31654,
    "lon": 45.33241,
    "alt_m": 14484.1
   },
   "member_spread_deg": {
    "lat": 49.27,
    "lon": 132.04
   },
   "member_spread_now_deg": {
    "lat": 18.69,
    "lon": 32.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "N4TVV-4",
   "flight_id": "N4TVV-4_2026-09-05",
   "payload_type": "APRS",
   "seed_time": "2026-09-21 23:21:55",
   "seed_lat": 46.33,
   "seed_lon": 147.514,
   "seed_alt_m": 12666.0,
   "seed_age_h": 65.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 33.73869,
    "lon": -115.961,
    "alt_m": 12974.7
   },
   "member_spread_deg": {
    "lat": 61.94,
    "lon": 254.94
   },
   "member_spread_now_deg": {
    "lat": 31.19,
    "lon": 326.17
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "NE9JJ-11",
   "flight_id": "NE9JJ-11_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 00:33:00",
   "seed_lat": 30.5625,
   "seed_lon": -133.41667,
   "seed_alt_m": 13230.0,
   "seed_age_h": 16.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 33.00074,
    "lon": 8.90533,
    "alt_m": 13156.3
   },
   "member_spread_deg": {
    "lat": 45.55,
    "lon": 109.15
   },
   "member_spread_now_deg": {
    "lat": 1.16,
    "lon": 6.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "NQ1W-6",
   "flight_id": "NQ1W-6_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 01:41:00",
   "seed_lat": 24.375,
   "seed_lon": -170.625,
   "seed_alt_m": 13450.0,
   "seed_age_h": 15.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 32.34889,
    "lon": -0.70876,
    "alt_m": 13462.0
   },
   "member_spread_deg": {
    "lat": 34.46,
    "lon": 101.8
   },
   "member_spread_now_deg": {
    "lat": 4.96,
    "lon": 5.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "PE2BZ-11",
   "flight_id": "PE2BZ-11_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-23 15:32:47",
   "seed_lat": 35.57308,
   "seed_lon": 6.40783,
   "seed_alt_m": 12600.0,
   "seed_age_h": 25.79,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 43.52935,
    "lon": -160.9787,
    "alt_m": 12612.4
   },
   "member_spread_deg": {
    "lat": 16.83,
    "lon": 302.49
   },
   "member_spread_now_deg": {
    "lat": 5.98,
    "lon": 9.23
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-12",
   "flight_id": "SP0LND-12_2026-09-19",
   "payload_type": "APRS",
   "seed_time": "2026-09-24 14:38:48",
   "seed_lat": 44.85758,
   "seed_lon": 27.55167,
   "seed_alt_m": 13732.0,
   "seed_age_h": 2.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 14:15:00",
    "lat": 56.52999,
    "lon": 80.43528,
    "alt_m": 13474.9
   },
   "member_spread_deg": {
    "lat": 14.43,
    "lon": 102.76
   },
   "member_spread_now_deg": {
    "lat": 0.61,
    "lon": 0.83
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-13",
   "flight_id": "SP0LND-13_2026-08-13",
   "payload_type": "APRS",
   "seed_time": "2026-09-15 14:54:25",
   "seed_lat": 53.91942,
   "seed_lon": -95.70808,
   "seed_alt_m": 13217.0,
   "seed_age_h": 218.43,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 39.12116,
    "lon": 117.68024,
    "alt_m": 13634.9
   },
   "member_spread_deg": {
    "lat": 44.83,
    "lon": 320.6
   },
   "member_spread_now_deg": {
    "lat": 16.19,
    "lon": 267.47
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-14",
   "flight_id": "SP0LND-14_2026-09-09",
   "payload_type": "APRS",
   "seed_time": "2026-09-13 10:47:50",
   "seed_lat": 71.62158,
   "seed_lon": 24.96141,
   "seed_alt_m": 13354.0,
   "seed_age_h": 270.54,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 70.15759,
    "lon": 70.80731,
    "alt_m": 13001.3
   },
   "member_spread_deg": {
    "lat": 39.86,
    "lon": 283.44
   },
   "member_spread_now_deg": {
    "lat": 37.58,
    "lon": 341.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-15",
   "flight_id": "SP0LND-15_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-17 07:31:21",
   "seed_lat": 46.4615,
   "seed_lon": 27.87242,
   "seed_alt_m": 14195.0,
   "seed_age_h": 177.81,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 28.4087,
    "lon": -55.72532,
    "alt_m": 14757.8
   },
   "member_spread_deg": {
    "lat": 46.16,
    "lon": 68.12
   },
   "member_spread_now_deg": {
    "lat": 37.86,
    "lon": 335.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-39",
   "flight_id": "SP0LND-39_2026-08-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:15:00",
   "seed_lat": 44.41667,
   "seed_lon": -30.25,
   "seed_alt_m": 14100.0,
   "seed_age_h": 1.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 15:45:00",
    "lat": 54.34084,
    "lon": -144.14737,
    "alt_m": 13576.4
   },
   "member_spread_deg": {
    "lat": 14.44,
    "lon": 320.07
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 1.56
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-09-06",
   "payload_type": "APRS",
   "seed_time": "2026-09-24 17:04:43",
   "seed_lat": 45.18866,
   "seed_lon": -80.04083,
   "seed_alt_m": 14101.0,
   "seed_age_h": 0.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 17:00:00",
    "lat": 25.26507,
    "lon": -30.69781,
    "alt_m": 14505.1
   },
   "member_spread_deg": {
    "lat": 24.54,
    "lon": 101.18
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-9",
   "flight_id": "SP0LND-9_2026-08-27",
   "payload_type": "APRS",
   "seed_time": "2026-09-13 15:15:20",
   "seed_lat": 42.07925,
   "seed_lon": 23.58366,
   "seed_alt_m": 13938.0,
   "seed_age_h": 266.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 45.85719,
    "lon": 71.59806,
    "alt_m": 13852.3
   },
   "member_spread_deg": {
    "lat": 20.73,
    "lon": 95.99
   },
   "member_spread_now_deg": {
    "lat": 21.16,
    "lon": 104.2
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 09:23:00",
   "seed_lat": 49.95833,
   "seed_lon": 89.875,
   "seed_alt_m": 15370.0,
   "seed_age_h": 7.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 51.92638,
    "lon": -101.59198,
    "alt_m": 15065.2
   },
   "member_spread_deg": {
    "lat": 18.02,
    "lon": 41.24
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 1.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 09:27:00",
   "seed_lat": 41.72918,
   "seed_lon": 113.33333,
   "seed_alt_m": 13560.0,
   "seed_age_h": 7.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 72.82679,
    "lon": 8.84671,
    "alt_m": 13455.6
   },
   "member_spread_deg": {
    "lat": 53.39,
    "lon": 133.74
   },
   "member_spread_now_deg": {
    "lat": 0.69,
    "lon": 5.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:07:00",
   "seed_lat": 42.95833,
   "seed_lon": -80.75,
   "seed_alt_m": 13650.0,
   "seed_age_h": 1.22,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 15:30:00",
    "lat": 32.40285,
    "lon": 16.94086,
    "alt_m": 13826.6
   },
   "member_spread_deg": {
    "lat": 19.08,
    "lon": 70.36
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.13
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-34",
   "flight_id": "VE3VRO-34_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 16:25:00",
   "seed_lat": 69.45833,
   "seed_lon": -68.83333,
   "seed_alt_m": 12030.0,
   "seed_age_h": 24.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 68.42732,
    "lon": 141.8903,
    "alt_m": 12270.4
   },
   "member_spread_deg": {
    "lat": 40.84,
    "lon": 268.74
   },
   "member_spread_now_deg": {
    "lat": 5.44,
    "lon": 8.61
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-23 14:21:00",
   "seed_lat": 66.02083,
   "seed_lon": 12.08333,
   "seed_alt_m": 12660.0,
   "seed_age_h": 26.98,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:45:00",
    "lat": 39.46849,
    "lon": -163.90262,
    "alt_m": 13298.3
   },
   "member_spread_deg": {
    "lat": 13.36,
    "lon": 342.42
   },
   "member_spread_now_deg": {
    "lat": 9.86,
    "lon": 24.0
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W5AJ-1",
   "flight_id": "W5AJ-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-09-14 19:55:29",
   "seed_lat": 59.41661,
   "seed_lon": -58.74997,
   "seed_alt_m": 11480.0,
   "seed_age_h": 237.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 40.4605,
    "lon": 46.17752,
    "alt_m": 12223.0
   },
   "member_spread_deg": {
    "lat": 44.97,
    "lon": 334.71
   },
   "member_spread_now_deg": {
    "lat": 25.53,
    "lon": 345.84
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "W7EEU-11",
   "flight_id": "W7EEU-11_2026-08-23",
   "payload_type": "APRS",
   "seed_time": "2026-09-19 14:28:59",
   "seed_lat": 63.95584,
   "seed_lon": 16.81967,
   "seed_alt_m": 11926.0,
   "seed_age_h": 122.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 53.64618,
    "lon": -28.29631,
    "alt_m": 11817.7
   },
   "member_spread_deg": {
    "lat": 32.74,
    "lon": 301.29
   },
   "member_spread_now_deg": {
    "lat": 22.73,
    "lon": 329.19
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 11:23:54",
   "seed_lat": 21.91658,
   "seed_lon": 37.1668,
   "seed_alt_m": 13000.0,
   "seed_age_h": 5.94,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": 28.30516,
    "lon": 178.60723,
    "alt_m": 13061.0
   },
   "member_spread_deg": {
    "lat": 27.96,
    "lon": 337.35
   },
   "member_spread_now_deg": {
    "lat": 1.76,
    "lon": 1.81
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 04:36:00",
   "seed_lat": -12.41667,
   "seed_lon": 161.5,
   "seed_alt_m": 15947.0,
   "seed_age_h": 12.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-01 11:30:00",
    "lat": -28.30496,
    "lon": -68.59802,
    "alt_m": 15600.4
   },
   "member_spread_deg": {
    "lat": 25.3,
    "lon": 94.29
   },
   "member_spread_now_deg": {
    "lat": 1.49,
    "lon": 1.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}