{
 "generated_utc": "2026-09-30T11:27:21Z",
 "gfs_cycle_utc": "2026-09-30T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 454.0,
  "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_20260930_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260930_06Z.geojson.gz"
 },
 "counts": {
  "flights": 49,
  "members": 9,
  "rows": 202410
 },
 "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": 163.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 44.69809,
    "lon": -109.86017,
    "alt_m": 13312.1
   },
   "member_spread_deg": {
    "lat": 39.6,
    "lon": 122.93
   },
   "member_spread_now_deg": {
    "lat": 29.12,
    "lon": 92.77
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "AE4ZZ-23",
   "flight_id": "AE4ZZ-23_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:51:41",
   "seed_lat": 38.10414,
   "seed_lon": 57.29167,
   "seed_alt_m": 13000.0,
   "seed_age_h": 0.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 10:15:00",
    "lat": 46.8485,
    "lon": -115.18609,
    "alt_m": 13173.7
   },
   "member_spread_deg": {
    "lat": 22.49,
    "lon": 63.93
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 09:38:40",
   "seed_lat": -66.25,
   "seed_lon": 107.58334,
   "seed_alt_m": 12150.0,
   "seed_age_h": 1.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 09:15:00",
    "lat": -62.73995,
    "lon": 26.23688,
    "alt_m": 12191.3
   },
   "member_spread_deg": {
    "lat": 25.58,
    "lon": 142.77
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 21:18:47",
   "seed_lat": 44.66667,
   "seed_lon": -85.45833,
   "seed_alt_m": 13470.0,
   "seed_age_h": 14.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 22.5413,
    "lon": -29.96147,
    "alt_m": 13694.3
   },
   "member_spread_deg": {
    "lat": 11.38,
    "lon": 55.27
   },
   "member_spread_now_deg": {
    "lat": 8.9,
    "lon": 4.71
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:37:18",
   "seed_lat": 28.85417,
   "seed_lon": -29.375,
   "seed_alt_m": 13590.0,
   "seed_age_h": 0.71,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 10:00:00",
    "lat": 33.49251,
    "lon": 117.94452,
    "alt_m": 13216.9
   },
   "member_spread_deg": {
    "lat": 10.58,
    "lon": 26.19
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 18:31:18",
   "seed_lat": 59.27083,
   "seed_lon": -89.66667,
   "seed_alt_m": 13210.0,
   "seed_age_h": 16.81,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 45.46827,
    "lon": 89.54228,
    "alt_m": 13603.3
   },
   "member_spread_deg": {
    "lat": 23.76,
    "lon": 172.14
   },
   "member_spread_now_deg": {
    "lat": 0.65,
    "lon": 7.89
   },
   "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": 243.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 18.07193,
    "lon": 153.15885,
    "alt_m": 11468.7
   },
   "member_spread_deg": {
    "lat": 38.62,
    "lon": 344.85
   },
   "member_spread_now_deg": {
    "lat": 16.9,
    "lon": 255.33
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DF7PN-427",
   "flight_id": "DF7PN-427_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:54:02",
   "seed_lat": 24.52083,
   "seed_lon": 25.95833,
   "seed_alt_m": 12650.0,
   "seed_age_h": 0.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 51.98948,
    "lon": -73.48767,
    "alt_m": 12075.1
   },
   "member_spread_deg": {
    "lat": 21.88,
    "lon": 37.32
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.15
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DF7PN-427e",
   "flight_id": "DF7PN-427e_2026-08-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:06:02",
   "seed_lat": 24.6263,
   "seed_lon": 25.08559,
   "seed_alt_m": 12670.0,
   "seed_age_h": 1.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 09:30:00",
    "lat": 48.96028,
    "lon": -73.79996,
    "alt_m": 12173.4
   },
   "member_spread_deg": {
    "lat": 18.97,
    "lon": 36.42
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-30",
   "flight_id": "DG2GG-30_2026-08-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 04:01:00",
   "seed_lat": 53.64583,
   "seed_lon": 155.29167,
   "seed_alt_m": 12260.0,
   "seed_age_h": 7.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 49.00821,
    "lon": -17.86565,
    "alt_m": 12794.6
   },
   "member_spread_deg": {
    "lat": 31.09,
    "lon": 149.82
   },
   "member_spread_now_deg": {
    "lat": 0.57,
    "lon": 4.94
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-31",
   "flight_id": "DG2GG-31_2026-08-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 14:02:00",
   "seed_lat": 21.33333,
   "seed_lon": -81.66667,
   "seed_alt_m": 13590.0,
   "seed_age_h": 45.3,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 23.17647,
    "lon": 19.19328,
    "alt_m": 13575.1
   },
   "member_spread_deg": {
    "lat": 17.49,
    "lon": 129.3
   },
   "member_spread_now_deg": {
    "lat": 9.52,
    "lon": 15.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-32",
   "flight_id": "DG2GG-32_2026-09-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 14:26:00",
   "seed_lat": 56.64583,
   "seed_lon": -16.75,
   "seed_alt_m": 13030.0,
   "seed_age_h": 20.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 47.58528,
    "lon": 81.16998,
    "alt_m": 13069.0
   },
   "member_spread_deg": {
    "lat": 21.46,
    "lon": 279.6
   },
   "member_spread_now_deg": {
    "lat": 5.07,
    "lon": 23.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-34",
   "flight_id": "DG2GG-34_2026-09-15",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 22:55:00",
   "seed_lat": 33.08333,
   "seed_lon": -119.0,
   "seed_alt_m": 13330.0,
   "seed_age_h": 12.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 19.63054,
    "lon": -23.05174,
    "alt_m": 13664.5
   },
   "member_spread_deg": {
    "lat": 10.38,
    "lon": 46.14
   },
   "member_spread_now_deg": {
    "lat": 5.32,
    "lon": 4.04
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-36",
   "flight_id": "DG2GG-36_2026-09-26",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:35:00",
   "seed_lat": 40.9375,
   "seed_lon": 69.5,
   "seed_alt_m": 12990.0,
   "seed_age_h": 0.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 10:00:00",
    "lat": 37.38626,
    "lon": -91.39227,
    "alt_m": 13195.9
   },
   "member_spread_deg": {
    "lat": 23.37,
    "lon": 88.54
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578",
   "flight_id": "DH1PR-578_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:56:17",
   "seed_lat": 35.33333,
   "seed_lon": 27.0,
   "seed_alt_m": 11500.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 46.72031,
    "lon": -87.60141,
    "alt_m": 11321.7
   },
   "member_spread_deg": {
    "lat": 5.83,
    "lon": 15.92
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DH1PR-578e",
   "flight_id": "DH1PR-578e_2026-09-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:57:02",
   "seed_lat": 35.32812,
   "seed_lon": 27.02083,
   "seed_alt_m": 11500.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 46.9054,
    "lon": -87.37242,
    "alt_m": 11308.0
   },
   "member_spread_deg": {
    "lat": 5.48,
    "lon": 16.3
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.02
   },
   "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": 286.02,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 8.20032,
    "lon": -52.50035,
    "alt_m": 15265.6
   },
   "member_spread_deg": {
    "lat": 42.74,
    "lon": 308.6
   },
   "member_spread_now_deg": {
    "lat": 46.71,
    "lon": 145.61
   },
   "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": 291.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 72.99929,
    "lon": 92.53983,
    "alt_m": 14077.8
   },
   "member_spread_deg": {
    "lat": 33.06,
    "lon": 335.67
   },
   "member_spread_now_deg": {
    "lat": 33.09,
    "lon": 39.52
   },
   "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": 262.66,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 26.19642,
    "lon": -6.16176,
    "alt_m": 14291.7
   },
   "member_spread_deg": {
    "lat": 31.6,
    "lon": 213.11
   },
   "member_spread_now_deg": {
    "lat": 58.6,
    "lon": 296.44
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DO3GU-8",
   "flight_id": "DO3GU-8_2026-08-12",
   "payload_type": "APRS",
   "seed_time": "2026-09-30 10:38:35",
   "seed_lat": 50.08242,
   "seed_lon": -3.64992,
   "seed_alt_m": 14397.0,
   "seed_age_h": 0.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 10:15:00",
    "lat": 54.95735,
    "lon": 158.28237,
    "alt_m": 14019.0
   },
   "member_spread_deg": {
    "lat": 15.99,
    "lon": 101.15
   },
   "member_spread_now_deg": {
    "lat": 0.36,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:43:00",
   "seed_lat": 34.89583,
   "seed_lon": 24.08333,
   "seed_alt_m": 13200.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 10:15:00",
    "lat": 56.12779,
    "lon": -123.43186,
    "alt_m": 12958.0
   },
   "member_spread_deg": {
    "lat": 26.83,
    "lon": 48.31
   },
   "member_spread_now_deg": {
    "lat": 0.02,
    "lon": 0.05
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 246.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 43.34541,
    "lon": 69.90658,
    "alt_m": 12962.0
   },
   "member_spread_deg": {
    "lat": 24.96,
    "lon": 245.74
   },
   "member_spread_now_deg": {
    "lat": 13.26,
    "lon": 165.42
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:55:45",
   "seed_lat": 49.12495,
   "seed_lon": -15.33331,
   "seed_alt_m": 13060.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 61.95908,
    "lon": 169.33646,
    "alt_m": 12942.0
   },
   "member_spread_deg": {
    "lat": 17.02,
    "lon": 344.05
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.06
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KJ4AWK-1",
   "flight_id": "KJ4AWK-1_2026-08-22",
   "payload_type": "APRS",
   "seed_time": "2026-09-26 23:40:52",
   "seed_lat": 59.10342,
   "seed_lon": -116.23583,
   "seed_alt_m": 12175.0,
   "seed_age_h": 83.65,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 83.42436,
    "lon": 11.13619,
    "alt_m": 11882.2
   },
   "member_spread_deg": {
    "lat": 39.2,
    "lon": 345.19
   },
   "member_spread_now_deg": {
    "lat": 7.59,
    "lon": 58.6
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KM6BWB-1",
   "flight_id": "KM6BWB-1_2026-09-21",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 04:28:25",
   "seed_lat": 33.08328,
   "seed_lon": 72.00001,
   "seed_alt_m": 12670.0,
   "seed_age_h": 6.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 36.12833,
    "lon": -31.23996,
    "alt_m": 12851.2
   },
   "member_spread_deg": {
    "lat": 29.0,
    "lon": 130.44
   },
   "member_spread_now_deg": {
    "lat": 2.67,
    "lon": 5.76
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KO4VAQ-1",
   "flight_id": "KO4VAQ-1_2026-09-07",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:53:25",
   "seed_lat": 23.89578,
   "seed_lon": 25.79169,
   "seed_alt_m": 13330.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 47.55607,
    "lon": -73.19577,
    "alt_m": 12807.6
   },
   "member_spread_deg": {
    "lat": 44.03,
    "lon": 288.41
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.12
   },
   "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": 234.31,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 19.46442,
    "lon": 74.64285,
    "alt_m": 15346.4
   },
   "member_spread_deg": {
    "lat": 39.88,
    "lon": 266.55
   },
   "member_spread_now_deg": {
    "lat": 33.11,
    "lon": 292.96
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "LU1DNQ-1",
   "flight_id": "LU1DNQ-1_2026-09-20",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 03:09:00",
   "seed_lat": -25.54234,
   "seed_lon": -178.75416,
   "seed_alt_m": 12850.0,
   "seed_age_h": 56.18,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": -19.58738,
    "lon": 70.9886,
    "alt_m": 13069.4
   },
   "member_spread_deg": {
    "lat": 36.88,
    "lon": 207.26
   },
   "member_spread_now_deg": {
    "lat": 18.75,
    "lon": 27.16
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 10:53:19",
   "seed_lat": 25.99995,
   "seed_lon": 13.54169,
   "seed_alt_m": 14630.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 46.88016,
    "lon": -104.59236,
    "alt_m": 14105.0
   },
   "member_spread_deg": {
    "lat": 26.29,
    "lon": 308.1
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.39
   },
   "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": 203.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 48.11484,
    "lon": 4.88497,
    "alt_m": 12755.1
   },
   "member_spread_deg": {
    "lat": 74.26,
    "lon": 349.07
   },
   "member_spread_now_deg": {
    "lat": 54.02,
    "lon": 294.48
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "NE9JJ-11",
   "flight_id": "NE9JJ-11_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 17:18:00",
   "seed_lat": 46.10417,
   "seed_lon": -44.41667,
   "seed_alt_m": 12960.0,
   "seed_age_h": 18.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 51.88918,
    "lon": 155.12168,
    "alt_m": 12458.0
   },
   "member_spread_deg": {
    "lat": 23.06,
    "lon": 58.98
   },
   "member_spread_now_deg": {
    "lat": 1.25,
    "lon": 7.51
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "NQ1W-6",
   "flight_id": "NQ1W-6_2026-09-11",
   "payload_type": "WSPR",
   "seed_time": "2026-09-28 18:36:00",
   "seed_lat": 10.85417,
   "seed_lon": -102.54167,
   "seed_alt_m": 8500.0,
   "seed_age_h": 40.73,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 23.9459,
    "lon": -124.59354,
    "alt_m": 8408.4
   },
   "member_spread_deg": {
    "lat": 46.4,
    "lon": 71.82
   },
   "member_spread_now_deg": {
    "lat": 11.7,
    "lon": 7.91
   },
   "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": 96.09,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 24.68522,
    "lon": 69.24822,
    "alt_m": 8408.2
   },
   "member_spread_deg": {
    "lat": 24.88,
    "lon": 331.17
   },
   "member_spread_now_deg": {
    "lat": 28.83,
    "lon": 103.04
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-1",
   "flight_id": "SP0LND-1_2026-09-28",
   "payload_type": "APRS",
   "seed_time": "2026-09-30 11:04:56",
   "seed_lat": 37.64342,
   "seed_lon": 19.62408,
   "seed_alt_m": 13700.0,
   "seed_age_h": 0.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 32.1929,
    "lon": -170.27795,
    "alt_m": 13935.0
   },
   "member_spread_deg": {
    "lat": 23.71,
    "lon": 344.13
   },
   "member_spread_now_deg": {
    "lat": 0.0,
    "lon": 0.0
   },
   "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": 140.69,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 49.2091,
    "lon": -122.43628,
    "alt_m": 14017.2
   },
   "member_spread_deg": {
    "lat": 35.32,
    "lon": 254.26
   },
   "member_spread_now_deg": {
    "lat": 10.94,
    "lon": 327.36
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-13",
   "flight_id": "SP0LND-13_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-28 10:22:44",
   "seed_lat": 43.07875,
   "seed_lon": 28.26709,
   "seed_alt_m": 13750.0,
   "seed_age_h": 48.96,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 66.19403,
    "lon": -81.99718,
    "alt_m": 13103.8
   },
   "member_spread_deg": {
    "lat": 16.51,
    "lon": 72.51
   },
   "member_spread_now_deg": {
    "lat": 3.44,
    "lon": 32.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-15",
   "flight_id": "SP0LND-15_2026-09-16",
   "payload_type": "APRS",
   "seed_time": "2026-09-27 22:55:21",
   "seed_lat": 15.6015,
   "seed_lon": -91.11869,
   "seed_alt_m": 14954.0,
   "seed_age_h": 60.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 0.08846,
    "lon": -68.03347,
    "alt_m": 14931.0
   },
   "member_spread_deg": {
    "lat": 17.37,
    "lon": 36.53
   },
   "member_spread_now_deg": {
    "lat": 11.53,
    "lon": 10.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP0LND-39",
   "flight_id": "SP0LND-39_2026-08-27",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 02:35:00",
   "seed_lat": 52.16667,
   "seed_lon": 169.875,
   "seed_alt_m": 13700.0,
   "seed_age_h": 8.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 48.57985,
    "lon": 40.14751,
    "alt_m": 13995.6
   },
   "member_spread_deg": {
    "lat": 30.54,
    "lon": 80.93
   },
   "member_spread_now_deg": {
    "lat": 1.48,
    "lon": 2.17
   },
   "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": 110.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 39.06679,
    "lon": 106.90371,
    "alt_m": 14111.9
   },
   "member_spread_deg": {
    "lat": 11.56,
    "lon": 287.38
   },
   "member_spread_now_deg": {
    "lat": 9.24,
    "lon": 50.06
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 00:21:00",
   "seed_lat": 54.27083,
   "seed_lon": -139.375,
   "seed_alt_m": 15140.0,
   "seed_age_h": 10.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 71.8196,
    "lon": -17.99894,
    "alt_m": 14825.6
   },
   "member_spread_deg": {
    "lat": 17.35,
    "lon": 84.56
   },
   "member_spread_now_deg": {
    "lat": 0.59,
    "lon": 7.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-11",
   "flight_id": "SP6MPL-11_2026-09-29",
   "payload_type": "APRS",
   "seed_time": "2026-09-30 11:03:16",
   "seed_lat": 47.58042,
   "seed_lon": 14.70175,
   "seed_alt_m": 8841.0,
   "seed_age_h": 0.28,
   "float_reliable": false,
   "dead_reckoned": false,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-10-07 11:00:00",
    "lat": 54.99902,
    "lon": -176.89816,
    "alt_m": 8615.8
   },
   "member_spread_deg": {
    "lat": 27.72,
    "lon": 354.41
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 18:07:00",
   "seed_lat": 53.10418,
   "seed_lon": -36.79167,
   "seed_alt_m": 13160.0,
   "seed_age_h": 17.22,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 55.30748,
    "lon": 83.71293,
    "alt_m": 12866.4
   },
   "member_spread_deg": {
    "lat": 18.69,
    "lon": 185.16
   },
   "member_spread_now_deg": {
    "lat": 1.25,
    "lon": 12.77
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 09:27:00",
   "seed_lat": 45.16666,
   "seed_lon": 4.875,
   "seed_alt_m": 14020.0,
   "seed_age_h": 1.88,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 09:00:00",
    "lat": 28.03191,
    "lon": -168.43034,
    "alt_m": 13767.5
   },
   "member_spread_deg": {
    "lat": 26.15,
    "lon": 338.07
   },
   "member_spread_now_deg": {
    "lat": 0.59,
    "lon": 0.47
   },
   "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": 138.42,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 73.59272,
    "lon": -34.50516,
    "alt_m": 11932.2
   },
   "member_spread_deg": {
    "lat": 18.49,
    "lon": 162.55
   },
   "member_spread_now_deg": {
    "lat": 8.87,
    "lon": 350.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 08:11:00",
   "seed_lat": 46.3125,
   "seed_lon": 79.375,
   "seed_alt_m": 13080.0,
   "seed_age_h": 3.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 07:45:00",
    "lat": 36.43782,
    "lon": -25.1832,
    "alt_m": 13292.4
   },
   "member_spread_deg": {
    "lat": 34.33,
    "lon": 155.31
   },
   "member_spread_now_deg": {
    "lat": 0.51,
    "lon": 1.43
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 260.85,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": 49.78973,
    "lon": 120.50912,
    "alt_m": 12523.1
   },
   "member_spread_deg": {
    "lat": 36.1,
    "lon": 220.45
   },
   "member_spread_now_deg": {
    "lat": 41.41,
    "lon": 133.52
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "WD4CFN-21",
   "flight_id": "WD4CFN-21_2026-09-13",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 05:49:00",
   "seed_lat": 25.10412,
   "seed_lon": 110.83338,
   "seed_alt_m": 13140.0,
   "seed_age_h": 5.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": 21.30039,
    "lon": 175.3235,
    "alt_m": 13139.1
   },
   "member_spread_deg": {
    "lat": 25.48,
    "lon": 332.27
   },
   "member_spread_now_deg": {
    "lat": 1.57,
    "lon": 0.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZL2P-1",
   "flight_id": "ZL2P-1_2026-09-28",
   "payload_type": "WSPR",
   "seed_time": "2026-09-29 22:25:00",
   "seed_lat": -68.625,
   "seed_lon": -97.79167,
   "seed_alt_m": 11800.0,
   "seed_age_h": 12.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-10-07 05:30:00",
    "lat": -55.34873,
    "lon": -113.03124,
    "alt_m": 11333.7
   },
   "member_spread_deg": {
    "lat": 29.99,
    "lon": 82.16
   },
   "member_spread_now_deg": {
    "lat": 1.07,
    "lon": 7.62
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "ZS6WBT-1",
   "flight_id": "ZS6WBT-1_2026-08-19",
   "payload_type": "WSPR",
   "seed_time": "2026-09-30 00:51:00",
   "seed_lat": -14.875,
   "seed_lon": -144.20833,
   "seed_alt_m": 15880.0,
   "seed_age_h": 10.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-10-07 05:45:00",
    "lat": -13.71109,
    "lon": -73.04699,
    "alt_m": 15810.4
   },
   "member_spread_deg": {
    "lat": 11.83,
    "lon": 124.08
   },
   "member_spread_now_deg": {
    "lat": 2.79,
    "lon": 2.97
   },
   "display_as": "track",
   "display_reason": "fresh"
  }
 ]
}