{
 "generated_utc": "2026-09-21T17:28:03Z",
 "gfs_cycle_utc": "2026-09-21T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 494.5,
  "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_20260921_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260921_12Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 209088
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 16:52:03",
   "seed_lat": 38.22912,
   "seed_lon": -70.74995,
   "seed_alt_m": 13510.0,
   "seed_age_h": 0.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 16:45:00",
    "lat": 34.89642,
    "lon": 13.40075,
    "alt_m": 13372.2
   },
   "member_spread_deg": {
    "lat": 46.17,
    "lon": 74.41
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 00:18:40",
   "seed_lat": -74.29167,
   "seed_lon": -123.99999,
   "seed_alt_m": 12180.0,
   "seed_age_h": 41.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": -78.925,
    "lon": -22.77131,
    "alt_m": 12042.1
   },
   "member_spread_deg": {
    "lat": 28.21,
    "lon": 98.32
   },
   "member_spread_now_deg": {
    "lat": 12.06,
    "lon": 12.63
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 03:12:18",
   "seed_lat": 41.02083,
   "seed_lon": 122.95833,
   "seed_alt_m": 13410.0,
   "seed_age_h": 14.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 27.37604,
    "lon": -171.93668,
    "alt_m": 13710.1
   },
   "member_spread_deg": {
    "lat": 23.14,
    "lon": 349.36
   },
   "member_spread_now_deg": {
    "lat": 2.7,
    "lon": 10.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 09:08:18",
   "seed_lat": 47.3125,
   "seed_lon": 120.20833,
   "seed_alt_m": 12730.0,
   "seed_age_h": 8.2,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 62.16236,
    "lon": 36.1276,
    "alt_m": 12990.9
   },
   "member_spread_deg": {
    "lat": 20.17,
    "lon": 92.44
   },
   "member_spread_now_deg": {
    "lat": 1.12,
    "lon": 2.57
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-18 15:23:18",
   "seed_lat": 40.79167,
   "seed_lon": 19.75,
   "seed_alt_m": 14090.0,
   "seed_age_h": 73.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 51.63048,
    "lon": -121.79332,
    "alt_m": 13363.0
   },
   "member_spread_deg": {
    "lat": 30.63,
    "lon": 335.8
   },
   "member_spread_now_deg": {
    "lat": 11.16,
    "lon": 34.4
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 33.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 40.99324,
    "lon": 83.92498,
    "alt_m": 11354.9
   },
   "member_spread_deg": {
    "lat": 24.7,
    "lon": 310.51
   },
   "member_spread_now_deg": {
    "lat": 2.38,
    "lon": 13.01
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 06:04:31",
   "seed_lat": 45.25,
   "seed_lon": 106.33333,
   "seed_alt_m": 12200.0,
   "seed_age_h": 11.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 27.59166,
    "lon": -21.66588,
    "alt_m": 12317.7
   },
   "member_spread_deg": {
    "lat": 33.67,
    "lon": 152.79
   },
   "member_spread_now_deg": {
    "lat": 1.48,
    "lon": 1.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 04:45:02",
   "seed_lat": 44.90608,
   "seed_lon": 79.22761,
   "seed_alt_m": 12240.0,
   "seed_age_h": 36.58,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 30.5625,
    "lon": -5.16084,
    "alt_m": 12529.7
   },
   "member_spread_deg": {
    "lat": 32.3,
    "lon": 152.15
   },
   "member_spread_now_deg": {
    "lat": 1.67,
    "lon": 3.73
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-07 21:12:00",
   "seed_lat": 24.22917,
   "seed_lon": -100.08333,
   "seed_alt_m": 13800.0,
   "seed_age_h": 332.13,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 5.55203,
    "lon": -37.92905,
    "alt_m": 13944.1
   },
   "member_spread_deg": {
    "lat": 64.08,
    "lon": 300.57
   },
   "member_spread_now_deg": {
    "lat": 40.57,
    "lon": 216.55
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 07:06:00",
   "seed_lat": 62.91667,
   "seed_lon": 23.0,
   "seed_alt_m": 11970.0,
   "seed_age_h": 10.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 47.1208,
    "lon": 98.86332,
    "alt_m": 12309.7
   },
   "member_spread_deg": {
    "lat": 40.96,
    "lon": 88.05
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 1.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 10:17:00",
   "seed_lat": 39.79167,
   "seed_lon": 73.16667,
   "seed_alt_m": 13180.0,
   "seed_age_h": 7.05,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 52.23793,
    "lon": -42.63202,
    "alt_m": 12609.7
   },
   "member_spread_deg": {
    "lat": 12.08,
    "lon": 83.08
   },
   "member_spread_now_deg": {
    "lat": 0.47,
    "lon": 1.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 07:46:00",
   "seed_lat": 43.47917,
   "seed_lon": 76.75,
   "seed_alt_m": 13400.0,
   "seed_age_h": 9.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 51.68195,
    "lon": -40.63637,
    "alt_m": 12933.2
   },
   "member_spread_deg": {
    "lat": 16.92,
    "lon": 91.84
   },
   "member_spread_now_deg": {
    "lat": 0.78,
    "lon": 1.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 06:15:00",
   "seed_lat": 43.35417,
   "seed_lon": 129.79167,
   "seed_alt_m": 13080.0,
   "seed_age_h": 11.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 36.98376,
    "lon": -125.4009,
    "alt_m": 13420.1
   },
   "member_spread_deg": {
    "lat": 25.96,
    "lon": 267.73
   },
   "member_spread_now_deg": {
    "lat": 1.96,
    "lon": 7.3
   },
   "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": 76.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 16.98808,
    "lon": -38.63318,
    "alt_m": 15246.0
   },
   "member_spread_deg": {
    "lat": 45.03,
    "lon": 107.71
   },
   "member_spread_now_deg": {
    "lat": 12.17,
    "lon": 16.71
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 81.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 72.24055,
    "lon": -80.62969,
    "alt_m": 14140.6
   },
   "member_spread_deg": {
    "lat": 13.05,
    "lon": 45.91
   },
   "member_spread_now_deg": {
    "lat": 6.71,
    "lon": 17.57
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "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": 52.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 2.86574,
    "lon": 166.81688,
    "alt_m": 14479.2
   },
   "member_spread_deg": {
    "lat": 57.09,
    "lon": 344.34
   },
   "member_spread_now_deg": {
    "lat": 1.98,
    "lon": 33.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-18 08:14:06",
   "seed_lat": 42.27058,
   "seed_lon": 26.24284,
   "seed_alt_m": 14576.0,
   "seed_age_h": 81.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 59.745,
    "lon": -84.98486,
    "alt_m": 13843.4
   },
   "member_spread_deg": {
    "lat": 19.04,
    "lon": 303.37
   },
   "member_spread_now_deg": {
    "lat": 4.73,
    "lon": 18.25
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 16:23:00",
   "seed_lat": 35.375,
   "seed_lon": -97.95833,
   "seed_alt_m": 13450.0,
   "seed_age_h": 0.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 16:00:00",
    "lat": 47.43897,
    "lon": 29.87965,
    "alt_m": 13191.0
   },
   "member_spread_deg": {
    "lat": 33.38,
    "lon": 91.11
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "I1RFQ",
   "flight_id": "I1RFQ_2026-09-06",
   "payload_type": "WSPR",
   "seed_time": "2026-09-10 05:25:00",
   "seed_lat": 48.52083,
   "seed_lon": 159.54167,
   "seed_alt_m": 12130.0,
   "seed_age_h": 275.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 22.20238,
    "lon": -61.13688,
    "alt_m": 12700.9
   },
   "member_spread_deg": {
    "lat": 50.57,
    "lon": 222.57
   },
   "member_spread_now_deg": {
    "lat": 35.28,
    "lon": 240.9
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 138.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 18.13669,
    "lon": -34.83428,
    "alt_m": 13811.1
   },
   "member_spread_deg": {
    "lat": 24.28,
    "lon": 231.2
   },
   "member_spread_now_deg": {
    "lat": 40.27,
    "lon": 93.8
   },
   "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": 36.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 47.34417,
    "lon": -37.10114,
    "alt_m": 12938.8
   },
   "member_spread_deg": {
    "lat": 25.85,
    "lon": 78.5
   },
   "member_spread_now_deg": {
    "lat": 4.46,
    "lon": 358.0
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 227.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 48.0335,
    "lon": -151.40421,
    "alt_m": 12262.9
   },
   "member_spread_deg": {
    "lat": 15.53,
    "lon": 291.43
   },
   "member_spread_now_deg": {
    "lat": 26.68,
    "lon": 192.34
   },
   "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": 196.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 76.40453,
    "lon": 98.77155,
    "alt_m": 12127.9
   },
   "member_spread_deg": {
    "lat": 47.32,
    "lon": 186.98
   },
   "member_spread_now_deg": {
    "lat": 14.77,
    "lon": 71.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 03:25:45",
   "seed_lat": 62.87495,
   "seed_lon": -174.83331,
   "seed_alt_m": 12840.0,
   "seed_age_h": 13.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 62.33359,
    "lon": -21.81767,
    "alt_m": 12675.8
   },
   "member_spread_deg": {
    "lat": 5.38,
    "lon": 27.93
   },
   "member_spread_now_deg": {
    "lat": 1.21,
    "lon": 2.07
   },
   "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": 197.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 68.95603,
    "lon": -2.50947,
    "alt_m": 11996.5
   },
   "member_spread_deg": {
    "lat": 27.22,
    "lon": 338.66
   },
   "member_spread_now_deg": {
    "lat": 14.86,
    "lon": 310.82
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KO4VAQ-1",
   "flight_id": "KO4VAQ-1_2026-09-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 01:43:25",
   "seed_lat": 28.39578,
   "seed_lon": -160.99999,
   "seed_alt_m": 13300.0,
   "seed_age_h": 15.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 25.47311,
    "lon": -27.31971,
    "alt_m": 13401.8
   },
   "member_spread_deg": {
    "lat": 37.0,
    "lon": 67.47
   },
   "member_spread_now_deg": {
    "lat": 4.69,
    "lon": 11.76
   },
   "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": 24.31,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 14.9546,
    "lon": 137.64515,
    "alt_m": 15430.9
   },
   "member_spread_deg": {
    "lat": 27.84,
    "lon": 328.64
   },
   "member_spread_now_deg": {
    "lat": 5.29,
    "lon": 7.38
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 06:33:19",
   "seed_lat": 47.37495,
   "seed_lon": 103.37502,
   "seed_alt_m": 13900.0,
   "seed_age_h": 10.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 48.61451,
    "lon": -18.95642,
    "alt_m": 13986.1
   },
   "member_spread_deg": {
    "lat": 36.39,
    "lon": 199.17
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 5.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "N4TVV-4",
   "flight_id": "N4TVV-4_2026-09-05",
   "payload_type": "APRS",
   "seed_time": "2026-09-21 07:56:05",
   "seed_lat": 35.96634,
   "seed_lon": 122.60608,
   "seed_alt_m": 12947.0,
   "seed_age_h": 9.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 34.55399,
    "lon": -161.79884,
    "alt_m": 13028.0
   },
   "member_spread_deg": {
    "lat": 39.0,
    "lon": 290.98
   },
   "member_spread_now_deg": {
    "lat": 2.73,
    "lon": 1.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "NE9JJ-11",
   "flight_id": "NE9JJ-11_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 04:05:30",
   "seed_lat": 27.125,
   "seed_lon": 170.41667,
   "seed_alt_m": 13115.0,
   "seed_age_h": 13.24,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 47.9142,
    "lon": -16.42866,
    "alt_m": 12792.6
   },
   "member_spread_deg": {
    "lat": 44.1,
    "lon": 169.59
   },
   "member_spread_now_deg": {
    "lat": 2.18,
    "lon": 5.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "NQ1W-6",
   "flight_id": "NQ1W-6_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 05:41:00",
   "seed_lat": 39.77083,
   "seed_lon": 105.16667,
   "seed_alt_m": 13060.0,
   "seed_age_h": 11.65,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 33.58681,
    "lon": -170.40308,
    "alt_m": 13243.5
   },
   "member_spread_deg": {
    "lat": 33.66,
    "lon": 355.87
   },
   "member_spread_now_deg": {
    "lat": 1.09,
    "lon": 4.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "PE2BZ-11",
   "flight_id": "PE2BZ-11_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-21 15:59:27",
   "seed_lat": 42.46633,
   "seed_lon": -3.77642,
   "seed_alt_m": 12840.0,
   "seed_age_h": 1.34,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 15:30:00",
    "lat": 37.50932,
    "lon": 73.90242,
    "alt_m": 12376.6
   },
   "member_spread_deg": {
    "lat": 18.33,
    "lon": 68.19
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 0.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-12",
   "flight_id": "SP0LND-12_2026-09-19",
   "payload_type": "APRS",
   "seed_time": "2026-09-21 14:14:07",
   "seed_lat": 64.99734,
   "seed_lon": 26.84733,
   "seed_alt_m": 13239.0,
   "seed_age_h": 3.1,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 13:45:00",
    "lat": 41.49034,
    "lon": 135.74192,
    "alt_m": 13796.1
   },
   "member_spread_deg": {
    "lat": 30.66,
    "lon": 107.95
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.12
   },
   "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": 146.43,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 44.86477,
    "lon": 27.97488,
    "alt_m": 13639.6
   },
   "member_spread_deg": {
    "lat": 29.96,
    "lon": 341.34
   },
   "member_spread_now_deg": {
    "lat": 39.89,
    "lon": 295.08
   },
   "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": 198.54,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 70.16625,
    "lon": -46.0096,
    "alt_m": 12911.8
   },
   "member_spread_deg": {
    "lat": 20.98,
    "lon": 212.71
   },
   "member_spread_now_deg": {
    "lat": 38.5,
    "lon": 268.99
   },
   "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": 105.81,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 29.00017,
    "lon": -91.21193,
    "alt_m": 14581.1
   },
   "member_spread_deg": {
    "lat": 41.94,
    "lon": 118.07
   },
   "member_spread_now_deg": {
    "lat": 8.0,
    "lon": 41.3
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "SP0LND-39",
   "flight_id": "SP0LND-39_2026-08-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-20 23:50:00",
   "seed_lat": 47.14583,
   "seed_lon": -138.125,
   "seed_alt_m": 13650.0,
   "seed_age_h": 17.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 53.88525,
    "lon": 90.08625,
    "alt_m": 13540.4
   },
   "member_spread_deg": {
    "lat": 34.76,
    "lon": 125.36
   },
   "member_spread_now_deg": {
    "lat": 4.89,
    "lon": 18.99
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-09-06",
   "payload_type": "APRS",
   "seed_time": "2026-09-21 01:02:23",
   "seed_lat": 44.55234,
   "seed_lon": -123.39266,
   "seed_alt_m": 14174.0,
   "seed_age_h": 16.29,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 32.98681,
    "lon": -31.26217,
    "alt_m": 14674.3
   },
   "member_spread_deg": {
    "lat": 10.99,
    "lon": 38.61
   },
   "member_spread_now_deg": {
    "lat": 5.43,
    "lon": 1.43
   },
   "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": 194.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 31.1414,
    "lon": 7.36803,
    "alt_m": 14361.2
   },
   "member_spread_deg": {
    "lat": 47.27,
    "lon": 115.32
   },
   "member_spread_now_deg": {
    "lat": 18.5,
    "lon": 350.72
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 10:21:00",
   "seed_lat": 63.02083,
   "seed_lon": 64.125,
   "seed_alt_m": 15400.0,
   "seed_age_h": 6.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 50.05683,
    "lon": -162.35082,
    "alt_m": 15202.3
   },
   "member_spread_deg": {
    "lat": 6.24,
    "lon": 354.64
   },
   "member_spread_now_deg": {
    "lat": 0.79,
    "lon": 2.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 12:32:00",
   "seed_lat": 33.70835,
   "seed_lon": 31.70833,
   "seed_alt_m": 14040.0,
   "seed_age_h": 4.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 12:00:00",
    "lat": 49.65449,
    "lon": -82.64348,
    "alt_m": 13557.4
   },
   "member_spread_deg": {
    "lat": 25.55,
    "lon": 298.51
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 1.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 16:42:00",
   "seed_lat": 44.35416,
   "seed_lon": -116.125,
   "seed_alt_m": 13740.0,
   "seed_age_h": 0.63,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 16:45:00",
    "lat": 26.81402,
    "lon": -37.82285,
    "alt_m": 14271.0
   },
   "member_spread_deg": {
    "lat": 10.24,
    "lon": 44.71
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-34",
   "flight_id": "VE3VRO-34_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-15 04:40:00",
   "seed_lat": 72.0,
   "seed_lon": 103.25,
   "seed_alt_m": 12430.0,
   "seed_age_h": 156.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": 81.24359,
    "lon": 66.01883,
    "alt_m": 11855.3
   },
   "member_spread_deg": {
    "lat": 32.21,
    "lon": 275.03
   },
   "member_spread_now_deg": {
    "lat": 18.79,
    "lon": 286.93
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 14:21:00",
   "seed_lat": 47.875,
   "seed_lon": -75.20833,
   "seed_alt_m": 12900.0,
   "seed_age_h": 2.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 13:45:00",
    "lat": 44.46978,
    "lon": 63.46822,
    "alt_m": 12883.3
   },
   "member_spread_deg": {
    "lat": 25.63,
    "lon": 142.02
   },
   "member_spread_now_deg": {
    "lat": 0.74,
    "lon": 2.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-09-08 21:35:23",
   "seed_lat": 52.33328,
   "seed_lon": -95.95831,
   "seed_alt_m": 12860.0,
   "seed_age_h": 307.74,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 29.68872,
    "lon": 7.39176,
    "alt_m": 13500.1
   },
   "member_spread_deg": {
    "lat": 48.85,
    "lon": 205.33
   },
   "member_spread_now_deg": {
    "lat": 42.44,
    "lon": 334.16
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 165.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 28.46158,
    "lon": -20.26207,
    "alt_m": 12235.9
   },
   "member_spread_deg": {
    "lat": 45.5,
    "lon": 260.27
   },
   "member_spread_now_deg": {
    "lat": 9.26,
    "lon": 81.15
   },
   "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": 50.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-28 11:30:00",
    "lat": 75.35688,
    "lon": -62.5877,
    "alt_m": 11790.3
   },
   "member_spread_deg": {
    "lat": 19.53,
    "lon": 354.87
   },
   "member_spread_now_deg": {
    "lat": 7.88,
    "lon": 49.89
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 15:50:33",
   "seed_lat": 22.52075,
   "seed_lon": -20.99989,
   "seed_alt_m": 13260.0,
   "seed_age_h": 1.49,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-28 15:15:00",
    "lat": 28.9361,
    "lon": 127.83951,
    "alt_m": 13118.5
   },
   "member_spread_deg": {
    "lat": 21.05,
    "lon": 137.59
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 06:08:30",
   "seed_lat": -13.85417,
   "seed_lon": 154.625,
   "seed_alt_m": 15860.0,
   "seed_age_h": 11.19,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-28 11:45:00",
    "lat": -13.67051,
    "lon": -171.36608,
    "alt_m": 15834.1
   },
   "member_spread_deg": {
    "lat": 23.96,
    "lon": 348.72
   },
   "member_spread_now_deg": {
    "lat": 1.37,
    "lon": 4.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}