{
 "generated_utc": "2026-09-22T11:27:51Z",
 "gfs_cycle_utc": "2026-09-22T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 488.0,
  "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_20260922_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260922_06Z.geojson.gz"
 },
 "counts": {
  "flights": 48,
  "members": 9,
  "rows": 206730
 },
 "flights": [
  {
   "callsign": "AE4ZZ-22",
   "flight_id": "AE4ZZ-22_2026-09-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 18:53:45",
   "seed_lat": 38.41662,
   "seed_lon": -69.49996,
   "seed_alt_m": 13560.0,
   "seed_age_h": 16.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 41.38426,
    "lon": 49.74017,
    "alt_m": 13176.6
   },
   "member_spread_deg": {
    "lat": 23.77,
    "lon": 56.92
   },
   "member_spread_now_deg": {
    "lat": 1.55,
    "lon": 1.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 10:28:40",
   "seed_lat": -56.04167,
   "seed_lon": 4.70834,
   "seed_alt_m": 12150.0,
   "seed_age_h": 0.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 10:00:00",
    "lat": -65.11237,
    "lon": 85.00362,
    "alt_m": 12415.8
   },
   "member_spread_deg": {
    "lat": 17.99,
    "lon": 340.64
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 02:38:17",
   "seed_lat": 38.33333,
   "seed_lon": 174.16667,
   "seed_alt_m": 13760.0,
   "seed_age_h": 8.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 35.64415,
    "lon": -118.00642,
    "alt_m": 13672.7
   },
   "member_spread_deg": {
    "lat": 38.71,
    "lon": 323.46
   },
   "member_spread_now_deg": {
    "lat": 1.85,
    "lon": 4.03
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 05:57:18",
   "seed_lat": 55.04167,
   "seed_lon": 162.66667,
   "seed_alt_m": 12510.0,
   "seed_age_h": 5.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 37.91066,
    "lon": -66.50244,
    "alt_m": 12900.0
   },
   "member_spread_deg": {
    "lat": 25.21,
    "lon": 185.93
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 2.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 09:58:18",
   "seed_lat": 48.77083,
   "seed_lon": 60.83333,
   "seed_alt_m": 13900.0,
   "seed_age_h": 1.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 09:30:00",
    "lat": 56.10772,
    "lon": -104.64251,
    "alt_m": 13537.7
   },
   "member_spread_deg": {
    "lat": 11.04,
    "lon": 40.9
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 0.13
   },
   "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": 51.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 37.62548,
    "lon": 138.61434,
    "alt_m": 11358.4
   },
   "member_spread_deg": {
    "lat": 25.58,
    "lon": 350.89
   },
   "member_spread_now_deg": {
    "lat": 9.09,
    "lon": 38.89
   },
   "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": 29.26,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 49.77544,
    "lon": -48.2624,
    "alt_m": 12327.4
   },
   "member_spread_deg": {
    "lat": 23.72,
    "lon": 103.48
   },
   "member_spread_now_deg": {
    "lat": 6.18,
    "lon": 7.38
   },
   "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": 54.58,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 44.69911,
    "lon": -64.16917,
    "alt_m": 12114.0
   },
   "member_spread_deg": {
    "lat": 45.85,
    "lon": 120.12
   },
   "member_spread_now_deg": {
    "lat": 5.85,
    "lon": 9.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 28.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 50.50395,
    "lon": 59.01951,
    "alt_m": 12631.3
   },
   "member_spread_deg": {
    "lat": 16.15,
    "lon": 56.18
   },
   "member_spread_now_deg": {
    "lat": 3.83,
    "lon": 5.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 08:37:00",
   "seed_lat": 39.85417,
   "seed_lon": 100.41667,
   "seed_alt_m": 13220.0,
   "seed_age_h": 2.72,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 08:00:00",
    "lat": 32.29502,
    "lon": -77.28708,
    "alt_m": 13405.4
   },
   "member_spread_deg": {
    "lat": 31.28,
    "lon": 81.31
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 1.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 06:46:00",
   "seed_lat": 43.77083,
   "seed_lon": 101.5,
   "seed_alt_m": 13410.0,
   "seed_age_h": 4.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 06:15:00",
    "lat": 64.2879,
    "lon": -71.10219,
    "alt_m": 12673.7
   },
   "member_spread_deg": {
    "lat": 14.2,
    "lon": 89.49
   },
   "member_spread_now_deg": {
    "lat": 0.34,
    "lon": 1.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 03:10:00",
   "seed_lat": 40.60417,
   "seed_lon": 177.375,
   "seed_alt_m": 13400.0,
   "seed_age_h": 8.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 33.68694,
    "lon": -121.10626,
    "alt_m": 13400.2
   },
   "member_spread_deg": {
    "lat": 45.9,
    "lon": 333.06
   },
   "member_spread_now_deg": {
    "lat": 1.91,
    "lon": 6.28
   },
   "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": 94.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 18.76397,
    "lon": -30.43132,
    "alt_m": 15224.8
   },
   "member_spread_deg": {
    "lat": 43.65,
    "lon": 121.97
   },
   "member_spread_now_deg": {
    "lat": 12.1,
    "lon": 24.08
   },
   "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": 99.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 62.23932,
    "lon": -42.14173,
    "alt_m": 14070.3
   },
   "member_spread_deg": {
    "lat": 23.69,
    "lon": 90.88
   },
   "member_spread_now_deg": {
    "lat": 4.34,
    "lon": 32.15
   },
   "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": 70.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 42.61399,
    "lon": -95.37691,
    "alt_m": 13959.8
   },
   "member_spread_deg": {
    "lat": 35.46,
    "lon": 127.29
   },
   "member_spread_now_deg": {
    "lat": 10.34,
    "lon": 59.57
   },
   "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": 99.1,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 58.47289,
    "lon": -46.82387,
    "alt_m": 13973.6
   },
   "member_spread_deg": {
    "lat": 21.01,
    "lon": 122.14
   },
   "member_spread_now_deg": {
    "lat": 4.74,
    "lon": 27.52
   },
   "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 22:28:00",
   "seed_lat": 34.45833,
   "seed_lon": -94.08333,
   "seed_alt_m": 13530.0,
   "seed_age_h": 12.87,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 55.102,
    "lon": 100.49172,
    "alt_m": 12746.3
   },
   "member_spread_deg": {
    "lat": 19.24,
    "lon": 151.95
   },
   "member_spread_now_deg": {
    "lat": 0.79,
    "lon": 1.45
   },
   "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": 293.92,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 15.28237,
    "lon": -39.85888,
    "alt_m": 12739.5
   },
   "member_spread_deg": {
    "lat": 51.74,
    "lon": 204.0
   },
   "member_spread_now_deg": {
    "lat": 45.81,
    "lon": 225.28
   },
   "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": 156.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 23.02522,
    "lon": -12.55821,
    "alt_m": 13873.3
   },
   "member_spread_deg": {
    "lat": 29.81,
    "lon": 174.22
   },
   "member_spread_now_deg": {
    "lat": 35.55,
    "lon": 103.58
   },
   "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": 54.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 46.26952,
    "lon": -65.22087,
    "alt_m": 12913.9
   },
   "member_spread_deg": {
    "lat": 22.45,
    "lon": 67.89
   },
   "member_spread_now_deg": {
    "lat": 8.65,
    "lon": 358.18
   },
   "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": 245.25,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 46.49321,
    "lon": -131.23733,
    "alt_m": 12326.9
   },
   "member_spread_deg": {
    "lat": 32.82,
    "lon": 326.45
   },
   "member_spread_now_deg": {
    "lat": 33.61,
    "lon": 183.97
   },
   "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": 214.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 44.28184,
    "lon": 105.58114,
    "alt_m": 12525.9
   },
   "member_spread_deg": {
    "lat": 49.24,
    "lon": 328.15
   },
   "member_spread_now_deg": {
    "lat": 23.73,
    "lon": 98.76
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 03:10:45",
   "seed_lat": 53.81245,
   "seed_lon": -159.37498,
   "seed_alt_m": 12870.0,
   "seed_age_h": 8.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 75.01808,
    "lon": -28.2862,
    "alt_m": 12627.9
   },
   "member_spread_deg": {
    "lat": 30.34,
    "lon": 71.23
   },
   "member_spread_now_deg": {
    "lat": 0.49,
    "lon": 1.58
   },
   "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": 215.95,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 79.88799,
    "lon": 75.19425,
    "alt_m": 12315.8
   },
   "member_spread_deg": {
    "lat": 31.91,
    "lon": 256.91
   },
   "member_spread_now_deg": {
    "lat": 22.73,
    "lon": 335.76
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KO4VAQ-1",
   "flight_id": "KO4VAQ-1_2026-09-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 00:38:25",
   "seed_lat": 32.91661,
   "seed_lon": -139.49999,
   "seed_alt_m": 13180.0,
   "seed_age_h": 10.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 30.70663,
    "lon": -36.99298,
    "alt_m": 13315.4
   },
   "member_spread_deg": {
    "lat": 22.59,
    "lon": 51.95
   },
   "member_spread_now_deg": {
    "lat": 2.34,
    "lon": 5.13
   },
   "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": 42.31,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 26.90915,
    "lon": 161.21431,
    "alt_m": 15321.5
   },
   "member_spread_deg": {
    "lat": 24.05,
    "lon": 38.29
   },
   "member_spread_now_deg": {
    "lat": 4.91,
    "lon": 10.93
   },
   "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": 28.78,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 38.762,
    "lon": 3.17959,
    "alt_m": 14229.2
   },
   "member_spread_deg": {
    "lat": 49.56,
    "lon": 163.91
   },
   "member_spread_now_deg": {
    "lat": 5.28,
    "lon": 16.99
   },
   "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": 11.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 23.73186,
    "lon": -137.4569,
    "alt_m": 13083.2
   },
   "member_spread_deg": {
    "lat": 38.53,
    "lon": 313.09
   },
   "member_spread_now_deg": {
    "lat": 8.7,
    "lon": 357.9
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "NE9JJ-11",
   "flight_id": "NE9JJ-11_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 02:43:00",
   "seed_lat": 30.625,
   "seed_lon": -174.70833,
   "seed_alt_m": 13140.0,
   "seed_age_h": 8.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 41.14169,
    "lon": -11.86129,
    "alt_m": 12931.9
   },
   "member_spread_deg": {
    "lat": 11.77,
    "lon": 67.38
   },
   "member_spread_now_deg": {
    "lat": 3.72,
    "lon": 3.75
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "NQ1W-6",
   "flight_id": "NQ1W-6_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 02:56:00",
   "seed_lat": 46.70833,
   "seed_lon": 144.16667,
   "seed_alt_m": 12740.0,
   "seed_age_h": 8.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 32.23137,
    "lon": -168.9017,
    "alt_m": 13310.4
   },
   "member_spread_deg": {
    "lat": 49.17,
    "lon": 342.83
   },
   "member_spread_now_deg": {
    "lat": 2.5,
    "lon": 3.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "PE2BZ-11",
   "flight_id": "PE2BZ-11_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-22 11:04:36",
   "seed_lat": 47.78966,
   "seed_lon": 0.91066,
   "seed_alt_m": 12715.0,
   "seed_age_h": 0.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 11:00:00",
    "lat": 40.31168,
    "lon": 113.43271,
    "alt_m": 12270.3
   },
   "member_spread_deg": {
    "lat": 23.22,
    "lon": 79.14
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.24
   },
   "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": 21.1,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 58.41146,
    "lon": 79.23838,
    "alt_m": 13561.2
   },
   "member_spread_deg": {
    "lat": 20.39,
    "lon": 45.81
   },
   "member_spread_now_deg": {
    "lat": 0.76,
    "lon": 1.68
   },
   "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": 164.43,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 52.36971,
    "lon": 104.60496,
    "alt_m": 13295.8
   },
   "member_spread_deg": {
    "lat": 44.45,
    "lon": 281.8
   },
   "member_spread_now_deg": {
    "lat": 44.63,
    "lon": 327.81
   },
   "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": 216.54,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 68.50782,
    "lon": -35.72562,
    "alt_m": 12913.0
   },
   "member_spread_deg": {
    "lat": 25.93,
    "lon": 313.11
   },
   "member_spread_now_deg": {
    "lat": 36.92,
    "lon": 267.16
   },
   "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": 123.81,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 23.52755,
    "lon": -89.30355,
    "alt_m": 14624.5
   },
   "member_spread_deg": {
    "lat": 46.97,
    "lon": 148.14
   },
   "member_spread_now_deg": {
    "lat": 11.41,
    "lon": 74.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-39",
   "flight_id": "SP0LND-39_2026-08-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 17:55:00",
   "seed_lat": 61.45833,
   "seed_lon": -111.41667,
   "seed_alt_m": 13550.0,
   "seed_age_h": 17.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 57.63534,
    "lon": 151.28978,
    "alt_m": 13436.7
   },
   "member_spread_deg": {
    "lat": 30.12,
    "lon": 145.49
   },
   "member_spread_now_deg": {
    "lat": 8.72,
    "lon": 5.44
   },
   "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": 34.29,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 26.5255,
    "lon": -5.58198,
    "alt_m": 14401.7
   },
   "member_spread_deg": {
    "lat": 24.04,
    "lon": 64.94
   },
   "member_spread_now_deg": {
    "lat": 4.64,
    "lon": 12.65
   },
   "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": 212.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 25.50254,
    "lon": -42.56532,
    "alt_m": 14553.8
   },
   "member_spread_deg": {
    "lat": 50.52,
    "lon": 141.5
   },
   "member_spread_now_deg": {
    "lat": 17.87,
    "lon": 105.06
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 10:11:00",
   "seed_lat": 58.52083,
   "seed_lon": 76.70833,
   "seed_alt_m": 15460.0,
   "seed_age_h": 1.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 09:45:00",
    "lat": 49.63278,
    "lon": -145.29832,
    "alt_m": 15084.1
   },
   "member_spread_deg": {
    "lat": 10.8,
    "lon": 40.05
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.21
   },
   "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": 22.8,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 55.79083,
    "lon": -49.02669,
    "alt_m": 13397.8
   },
   "member_spread_deg": {
    "lat": 30.63,
    "lon": 324.03
   },
   "member_spread_now_deg": {
    "lat": 1.21,
    "lon": 8.82
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-21 22:52:00",
   "seed_lat": 46.54166,
   "seed_lon": -114.5,
   "seed_alt_m": 13710.0,
   "seed_age_h": 12.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 22.93965,
    "lon": -2.0637,
    "alt_m": 14087.5
   },
   "member_spread_deg": {
    "lat": 22.44,
    "lon": 73.08
   },
   "member_spread_now_deg": {
    "lat": 2.73,
    "lon": 3.88
   },
   "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": 174.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": 51.47833,
    "lon": 120.59387,
    "alt_m": 11982.9
   },
   "member_spread_deg": {
    "lat": 23.79,
    "lon": 233.54
   },
   "member_spread_now_deg": {
    "lat": 18.04,
    "lon": 283.09
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 10:31:00",
   "seed_lat": 48.5625,
   "seed_lon": -29.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 0.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 10:00:00",
    "lat": 45.75753,
    "lon": 105.96873,
    "alt_m": 12932.5
   },
   "member_spread_deg": {
    "lat": 12.99,
    "lon": 128.08
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 1.02
   },
   "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": 325.74,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 61.07103,
    "lon": 47.33569,
    "alt_m": 12976.0
   },
   "member_spread_deg": {
    "lat": 63.53,
    "lon": 113.64
   },
   "member_spread_now_deg": {
    "lat": 48.75,
    "lon": 338.84
   },
   "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": 183.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 44.94658,
    "lon": -55.0457,
    "alt_m": 12238.7
   },
   "member_spread_deg": {
    "lat": 38.35,
    "lon": 208.53
   },
   "member_spread_now_deg": {
    "lat": 8.06,
    "lon": 112.94
   },
   "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": 68.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-09-29 05:30:00",
    "lat": 55.54089,
    "lon": -127.06616,
    "alt_m": 12004.6
   },
   "member_spread_deg": {
    "lat": 23.67,
    "lon": 185.31
   },
   "member_spread_now_deg": {
    "lat": 10.51,
    "lon": 48.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 10:55:33",
   "seed_lat": 23.04158,
   "seed_lon": -6.87489,
   "seed_alt_m": 13110.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-09-29 11:00:00",
    "lat": 32.82106,
    "lon": 147.16252,
    "alt_m": 13113.5
   },
   "member_spread_deg": {
    "lat": 17.99,
    "lon": 348.65
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-22 05:08:30",
   "seed_lat": -14.08333,
   "seed_lon": 158.25,
   "seed_alt_m": 15970.0,
   "seed_age_h": 6.19,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-09-29 05:45:00",
    "lat": -21.89948,
    "lon": -130.35027,
    "alt_m": 15770.5
   },
   "member_spread_deg": {
    "lat": 17.63,
    "lon": 356.34
   },
   "member_spread_now_deg": {
    "lat": 1.3,
    "lon": 1.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}