{
 "generated_utc": "2026-09-26T17:28:06Z",
 "gfs_cycle_utc": "2026-09-26T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 481.0,
  "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_20260926_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260926_12Z.geojson.gz"
 },
 "counts": {
  "flights": 47,
  "members": 9,
  "rows": 207999
 },
 "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": 73.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 50.38659,
    "lon": 157.3341,
    "alt_m": 12773.2
   },
   "member_spread_deg": {
    "lat": 34.64,
    "lon": 332.86
   },
   "member_spread_now_deg": {
    "lat": 51.84,
    "lon": 54.94
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 14:10:00",
   "seed_lat": 36.60414,
   "seed_lon": 9.66669,
   "seed_alt_m": 13520.0,
   "seed_age_h": 3.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 13:45:00",
    "lat": 47.12877,
    "lon": 147.33039,
    "alt_m": 12743.2
   },
   "member_spread_deg": {
    "lat": 23.75,
    "lon": 326.11
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 0.67
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 04:03:40",
   "seed_lat": -68.29166,
   "seed_lon": -157.62499,
   "seed_alt_m": 12000.0,
   "seed_age_h": 13.27,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": -60.86697,
    "lon": -159.0638,
    "alt_m": 11967.3
   },
   "member_spread_deg": {
    "lat": 18.25,
    "lon": 328.75
   },
   "member_spread_now_deg": {
    "lat": 0.83,
    "lon": 14.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 05:21:19",
   "seed_lat": 41.54167,
   "seed_lon": -179.08333,
   "seed_alt_m": 13600.0,
   "seed_age_h": 11.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 35.51389,
    "lon": -77.46053,
    "alt_m": 13904.1
   },
   "member_spread_deg": {
    "lat": 46.89,
    "lon": 35.54
   },
   "member_spread_now_deg": {
    "lat": 1.64,
    "lon": 3.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:33:48",
   "seed_lat": 50.35417,
   "seed_lon": -58.29167,
   "seed_alt_m": 13020.0,
   "seed_age_h": 0.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:00:00",
    "lat": 43.81108,
    "lon": 98.69423,
    "alt_m": 13029.2
   },
   "member_spread_deg": {
    "lat": 8.63,
    "lon": 103.03
   },
   "member_spread_now_deg": {
    "lat": 0.27,
    "lon": 1.53
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 03:36:18",
   "seed_lat": 44.6875,
   "seed_lon": 150.83333,
   "seed_alt_m": 13610.0,
   "seed_age_h": 13.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 51.46698,
    "lon": 1.47172,
    "alt_m": 13820.2
   },
   "member_spread_deg": {
    "lat": 31.57,
    "lon": 172.66
   },
   "member_spread_now_deg": {
    "lat": 1.19,
    "lon": 9.45
   },
   "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": 153.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 50.17726,
    "lon": -91.27081,
    "alt_m": 11342.9
   },
   "member_spread_deg": {
    "lat": 36.42,
    "lon": 181.65
   },
   "member_spread_now_deg": {
    "lat": 22.42,
    "lon": 331.24
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:33:46",
   "seed_lat": 48.0,
   "seed_lon": -75.25,
   "seed_alt_m": 12380.0,
   "seed_age_h": 0.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:00:00",
    "lat": 39.8503,
    "lon": 106.73675,
    "alt_m": 12250.1
   },
   "member_spread_deg": {
    "lat": 11.53,
    "lon": 118.59
   },
   "member_spread_now_deg": {
    "lat": 0.35,
    "lon": 0.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:34:31",
   "seed_lat": 47.99714,
   "seed_lon": -75.26458,
   "seed_alt_m": 12380.0,
   "seed_age_h": 0.76,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:00:00",
    "lat": 40.05632,
    "lon": 106.47918,
    "alt_m": 12251.6
   },
   "member_spread_deg": {
    "lat": 15.2,
    "lon": 117.89
   },
   "member_spread_now_deg": {
    "lat": 0.35,
    "lon": 0.52
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 11:56:00",
   "seed_lat": 72.0,
   "seed_lon": 49.83333,
   "seed_alt_m": 12800.0,
   "seed_age_h": 5.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 51.65371,
    "lon": -121.27641,
    "alt_m": 12723.0
   },
   "member_spread_deg": {
    "lat": 18.55,
    "lon": 107.19
   },
   "member_spread_now_deg": {
    "lat": 0.9,
    "lon": 4.79
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 00:22:00",
   "seed_lat": 30.54167,
   "seed_lon": -132.33333,
   "seed_alt_m": 13420.0,
   "seed_age_h": 16.97,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 23.16978,
    "lon": -21.5722,
    "alt_m": 13574.1
   },
   "member_spread_deg": {
    "lat": 42.71,
    "lon": 137.86
   },
   "member_spread_now_deg": {
    "lat": 1.08,
    "lon": 3.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 15:26:00",
   "seed_lat": 54.85417,
   "seed_lon": -113.91667,
   "seed_alt_m": 12810.0,
   "seed_age_h": 1.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 15:00:00",
    "lat": 59.95243,
    "lon": 32.99696,
    "alt_m": 13493.0
   },
   "member_spread_deg": {
    "lat": 37.08,
    "lon": 80.38
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 0.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 01:10:00",
   "seed_lat": 39.39583,
   "seed_lon": 176.41667,
   "seed_alt_m": 13410.0,
   "seed_age_h": 16.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 21.10124,
    "lon": -92.36541,
    "alt_m": 13526.1
   },
   "member_spread_deg": {
    "lat": 51.83,
    "lon": 47.93
   },
   "member_spread_now_deg": {
    "lat": 1.81,
    "lon": 4.46
   },
   "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": 196.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 4.16907,
    "lon": -24.35817,
    "alt_m": 15325.2
   },
   "member_spread_deg": {
    "lat": 45.64,
    "lon": 293.95
   },
   "member_spread_now_deg": {
    "lat": 51.17,
    "lon": 83.45
   },
   "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": 201.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 47.7914,
    "lon": 69.55774,
    "alt_m": 14462.5
   },
   "member_spread_deg": {
    "lat": 33.2,
    "lon": 122.56
   },
   "member_spread_now_deg": {
    "lat": 10.03,
    "lon": 42.43
   },
   "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": 172.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": -6.19968,
    "lon": -102.80152,
    "alt_m": 14442.3
   },
   "member_spread_deg": {
    "lat": 57.23,
    "lon": 351.24
   },
   "member_spread_now_deg": {
    "lat": 39.81,
    "lon": 353.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 16:47:46",
   "seed_lat": 46.52836,
   "seed_lon": -116.58757,
   "seed_alt_m": 14139.0,
   "seed_age_h": 0.54,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:15:00",
    "lat": 52.7198,
    "lon": 49.54576,
    "alt_m": 14145.7
   },
   "member_spread_deg": {
    "lat": 26.66,
    "lon": 73.7
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 15:43:00",
   "seed_lat": 46.35417,
   "seed_lon": -3.83333,
   "seed_alt_m": 13430.0,
   "seed_age_h": 1.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 15:15:00",
    "lat": 42.94458,
    "lon": 108.29536,
    "alt_m": 13141.8
   },
   "member_spread_deg": {
    "lat": 7.8,
    "lon": 80.82
   },
   "member_spread_now_deg": {
    "lat": 0.34,
    "lon": 0.43
   },
   "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": 258.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 18.0091,
    "lon": 63.32887,
    "alt_m": 13807.0
   },
   "member_spread_deg": {
    "lat": 35.52,
    "lon": 213.11
   },
   "member_spread_now_deg": {
    "lat": 52.2,
    "lon": 127.8
   },
   "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": 156.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 51.59354,
    "lon": 53.27018,
    "alt_m": 12771.2
   },
   "member_spread_deg": {
    "lat": 29.38,
    "lon": 159.25
   },
   "member_spread_now_deg": {
    "lat": 32.27,
    "lon": 85.13
   },
   "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": 316.32,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 51.58382,
    "lon": 127.15007,
    "alt_m": 12170.9
   },
   "member_spread_deg": {
    "lat": 33.44,
    "lon": 302.86
   },
   "member_spread_now_deg": {
    "lat": 42.15,
    "lon": 184.48
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:55:45",
   "seed_lat": 68.72911,
   "seed_lon": -52.41665,
   "seed_alt_m": 12780.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 17:00:00",
    "lat": 78.69156,
    "lon": -37.03697,
    "alt_m": 12703.9
   },
   "member_spread_deg": {
    "lat": 51.38,
    "lon": 106.54
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 17:04:10",
   "seed_lat": 58.22075,
   "seed_lon": -119.72167,
   "seed_alt_m": 12277.0,
   "seed_age_h": 0.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 17:00:00",
    "lat": 68.93647,
    "lon": -15.26452,
    "alt_m": 12208.0
   },
   "member_spread_deg": {
    "lat": 33.88,
    "lon": 129.95
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.34
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KM6BWB-1",
   "flight_id": "KM6BWB-1_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 14:58:25",
   "seed_lat": 30.43744,
   "seed_lon": 1.9167,
   "seed_alt_m": 13040.0,
   "seed_age_h": 2.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 14:30:00",
    "lat": 32.31233,
    "lon": -161.65812,
    "alt_m": 12786.1
   },
   "member_spread_deg": {
    "lat": 20.8,
    "lon": 326.41
   },
   "member_spread_now_deg": {
    "lat": 0.76,
    "lon": 0.55
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KO4VAQ-1",
   "flight_id": "KO4VAQ-1_2026-09-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:43:25",
   "seed_lat": 35.79161,
   "seed_lon": -70.08331,
   "seed_alt_m": 13000.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:15:00",
    "lat": 36.07991,
    "lon": 83.95542,
    "alt_m": 12987.0
   },
   "member_spread_deg": {
    "lat": 43.51,
    "lon": 51.68
   },
   "member_spread_now_deg": {
    "lat": 0.43,
    "lon": 0.08
   },
   "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": 144.31,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 38.19686,
    "lon": 160.65328,
    "alt_m": 15299.6
   },
   "member_spread_deg": {
    "lat": 39.94,
    "lon": 317.16
   },
   "member_spread_now_deg": {
    "lat": 10.94,
    "lon": 81.14
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:53:19",
   "seed_lat": 52.08328,
   "seed_lon": -68.49998,
   "seed_alt_m": 14030.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 17:00:00",
    "lat": 35.8501,
    "lon": 81.43606,
    "alt_m": 14302.6
   },
   "member_spread_deg": {
    "lat": 32.08,
    "lon": 74.66
   },
   "member_spread_now_deg": {
    "lat": 0.24,
    "lon": 0.16
   },
   "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": 113.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 44.7965,
    "lon": -38.05464,
    "alt_m": 12908.9
   },
   "member_spread_deg": {
    "lat": 39.59,
    "lon": 266.42
   },
   "member_spread_now_deg": {
    "lat": 25.89,
    "lon": 347.39
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "NE9JJ-11",
   "flight_id": "NE9JJ-11_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:43:00",
   "seed_lat": 44.5625,
   "seed_lon": -88.33333,
   "seed_alt_m": 13180.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:15:00",
    "lat": 41.09958,
    "lon": 54.73061,
    "alt_m": 13079.3
   },
   "member_spread_deg": {
    "lat": 21.56,
    "lon": 87.78
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "NQ1W-6",
   "flight_id": "NQ1W-6_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:31:00",
   "seed_lat": 25.47917,
   "seed_lon": -93.0,
   "seed_alt_m": 13480.0,
   "seed_age_h": 0.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 16:00:00",
    "lat": 22.36817,
    "lon": -115.74058,
    "alt_m": 13487.2
   },
   "member_spread_deg": {
    "lat": 24.47,
    "lon": 58.74
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "PE2BZ-11",
   "flight_id": "PE2BZ-11_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 11:14:53",
   "seed_lat": 37.51909,
   "seed_lon": 40.01825,
   "seed_alt_m": 8463.0,
   "seed_age_h": 6.09,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 34.97968,
    "lon": 96.14452,
    "alt_m": 8414.4
   },
   "member_spread_deg": {
    "lat": 39.36,
    "lon": 274.14
   },
   "member_spread_now_deg": {
    "lat": 0.79,
    "lon": 2.46
   },
   "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": 50.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 36.015,
    "lon": -163.15649,
    "alt_m": 13931.4
   },
   "member_spread_deg": {
    "lat": 23.19,
    "lon": 307.63
   },
   "member_spread_now_deg": {
    "lat": 20.14,
    "lon": 14.14
   },
   "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": 266.43,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 41.74781,
    "lon": -167.96436,
    "alt_m": 13910.6
   },
   "member_spread_deg": {
    "lat": 35.85,
    "lon": 327.26
   },
   "member_spread_now_deg": {
    "lat": 45.79,
    "lon": 313.38
   },
   "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": 318.54,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 56.99586,
    "lon": 99.52774,
    "alt_m": 13252.4
   },
   "member_spread_deg": {
    "lat": 31.35,
    "lon": 311.43
   },
   "member_spread_now_deg": {
    "lat": 26.83,
    "lon": 327.28
   },
   "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": 225.81,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 22.41237,
    "lon": -47.11306,
    "alt_m": 14815.3
   },
   "member_spread_deg": {
    "lat": 49.42,
    "lon": 111.23
   },
   "member_spread_now_deg": {
    "lat": 33.98,
    "lon": 70.06
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-39",
   "flight_id": "SP0LND-39_2026-08-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-25 13:50:00",
   "seed_lat": 63.16667,
   "seed_lon": 3.58333,
   "seed_alt_m": 13500.0,
   "seed_age_h": 27.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 38.3815,
    "lon": -55.7615,
    "alt_m": 14257.1
   },
   "member_spread_deg": {
    "lat": 23.15,
    "lon": 149.54
   },
   "member_spread_now_deg": {
    "lat": 25.85,
    "lon": 44.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-09-06",
   "payload_type": "APRS",
   "seed_time": "2026-09-25 21:19:18",
   "seed_lat": 46.42192,
   "seed_lon": -69.50092,
   "seed_alt_m": 14148.0,
   "seed_age_h": 20.01,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 17.89137,
    "lon": 10.30554,
    "alt_m": 14562.0
   },
   "member_spread_deg": {
    "lat": 18.56,
    "lon": 28.7
   },
   "member_spread_now_deg": {
    "lat": 11.69,
    "lon": 21.08
   },
   "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": 314.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 47.62348,
    "lon": 108.37156,
    "alt_m": 13773.6
   },
   "member_spread_deg": {
    "lat": 22.88,
    "lon": 332.2
   },
   "member_spread_now_deg": {
    "lat": 32.37,
    "lon": 56.7
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 06:51:00",
   "seed_lat": 46.625,
   "seed_lon": 128.83333,
   "seed_alt_m": 15260.0,
   "seed_age_h": 10.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 47.65188,
    "lon": -55.52598,
    "alt_m": 15167.4
   },
   "member_spread_deg": {
    "lat": 18.83,
    "lon": 62.74
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 2.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 02:12:00",
   "seed_lat": 50.58335,
   "seed_lon": -162.95834,
   "seed_alt_m": 13300.0,
   "seed_age_h": 15.13,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 73.32929,
    "lon": 68.66274,
    "alt_m": 13283.7
   },
   "member_spread_deg": {
    "lat": 67.64,
    "lon": 138.92
   },
   "member_spread_now_deg": {
    "lat": 5.56,
    "lon": 7.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 16:17:00",
   "seed_lat": 33.39583,
   "seed_lon": -75.5,
   "seed_alt_m": 13820.0,
   "seed_age_h": 1.05,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 15:45:00",
    "lat": 73.53918,
    "lon": 59.44046,
    "alt_m": 13302.3
   },
   "member_spread_deg": {
    "lat": 45.49,
    "lon": 107.04
   },
   "member_spread_now_deg": {
    "lat": 0.17,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-34",
   "flight_id": "VE3VRO-34_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-24 16:55:00",
   "seed_lat": 62.66667,
   "seed_lon": -45.75,
   "seed_alt_m": 12010.0,
   "seed_age_h": 48.42,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 70.06,
    "lon": -145.26466,
    "alt_m": 12162.0
   },
   "member_spread_deg": {
    "lat": 34.28,
    "lon": 324.18
   },
   "member_spread_now_deg": {
    "lat": 5.15,
    "lon": 17.72
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 09:11:00",
   "seed_lat": 52.58333,
   "seed_lon": 78.58333,
   "seed_alt_m": 12970.0,
   "seed_age_h": 8.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": 56.22193,
    "lon": -141.15856,
    "alt_m": 12864.2
   },
   "member_spread_deg": {
    "lat": 17.05,
    "lon": 269.89
   },
   "member_spread_now_deg": {
    "lat": 1.18,
    "lon": 17.98
   },
   "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": 285.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 42.30461,
    "lon": 27.63,
    "alt_m": 11869.9
   },
   "member_spread_deg": {
    "lat": 50.2,
    "lon": 137.76
   },
   "member_spread_now_deg": {
    "lat": 30.35,
    "lon": 236.19
   },
   "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": 170.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 51.35858,
    "lon": 60.71725,
    "alt_m": 12170.3
   },
   "member_spread_deg": {
    "lat": 33.16,
    "lon": 151.26
   },
   "member_spread_now_deg": {
    "lat": 15.9,
    "lon": 357.74
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 05:55:33",
   "seed_lat": 30.9166,
   "seed_lon": 70.95844,
   "seed_alt_m": 12760.0,
   "seed_age_h": 11.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-03 11:30:00",
    "lat": 24.46953,
    "lon": -166.01352,
    "alt_m": 12995.1
   },
   "member_spread_deg": {
    "lat": 24.37,
    "lon": 326.86
   },
   "member_spread_now_deg": {
    "lat": 3.74,
    "lon": 4.84
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-26 04:51:00",
   "seed_lat": -15.79167,
   "seed_lon": 173.16667,
   "seed_alt_m": 15880.0,
   "seed_age_h": 12.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-03 11:45:00",
    "lat": -29.29163,
    "lon": -50.94559,
    "alt_m": 15259.7
   },
   "member_spread_deg": {
    "lat": 40.38,
    "lon": 82.52
   },
   "member_spread_now_deg": {
    "lat": 1.49,
    "lon": 358.84
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}