{
 "generated_utc": "2026-08-05T05:27:34Z",
 "gfs_cycle_utc": "2026-08-05T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 489.5,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 336.0,
  "track_max_age_h": 72.0,
  "region_spread_deg": 60.0,
  "note": "A trajectory is served for 336 h after the last real fix and then the flight disappears. That matches the archive's own bridging limit: 23% of flights go quiet for over a week and are then heard again, so a shorter window drops balloons that are still flying. Past dead_reckoned flights the balloon has not been heard from since seed_time, so its present position is a prediction too -- the silent period is reconstructed from GFS analyses of weather that has already happened, which is why wind_source distinguishes analysis from forecast. Use display_as, not seed_age_h, to decide how to draw a flight: 'track' means the members still agree and a line is meaningful, 'region' means draw the member envelope instead because the nominal member is no better than any other."
 },
 "members": {
  "offsets_m": [
   -2000,
   -1500,
   -1000,
   -500,
   0,
   500,
   1000,
   1500,
   2000
  ],
  "nominal_offset_m": 0,
  "note": "Each member is seeded at the last observed altitude plus its offset and then conserves the density it started with. The ladder is a sensitivity fan, not a probability distribution: adjacent members diverge by roughly 1,200 km over seven days. levels_spanned reports how many GFS levels the fan actually straddles, usually 2 or 3."
 },
 "files": {
  "trajectories_csv_gz": "PBA_forecast_20260805_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260805_00Z.geojson.gz"
 },
 "counts": {
  "flights": 36,
  "members": 9,
  "rows": 181530
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 20:08:40",
   "seed_lat": -44.66667,
   "seed_lon": -54.54165,
   "seed_alt_m": 12600.0,
   "seed_age_h": 9.19,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": -33.02091,
    "lon": -148.5975,
    "alt_m": 12961.6
   },
   "member_spread_deg": {
    "lat": 11.63,
    "lon": 36.9
   },
   "member_spread_now_deg": {
    "lat": 1.47,
    "lon": 1.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS52",
   "flight_id": "BSS52_2025-12-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 17:39:48",
   "seed_lat": 59.97917,
   "seed_lon": 4.08333,
   "seed_alt_m": 13000.0,
   "seed_age_h": 275.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 50.57724,
    "lon": -65.41294,
    "alt_m": 12757.8
   },
   "member_spread_deg": {
    "lat": 58.32,
    "lon": 233.44
   },
   "member_spread_now_deg": {
    "lat": 44.32,
    "lon": 351.71
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 20:00:19",
   "seed_lat": 77.72917,
   "seed_lon": -128.125,
   "seed_alt_m": 12630.0,
   "seed_age_h": 9.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 53.80502,
    "lon": 8.11314,
    "alt_m": 12760.7
   },
   "member_spread_deg": {
    "lat": 20.15,
    "lon": 173.76
   },
   "member_spread_now_deg": {
    "lat": 3.53,
    "lon": 4.57
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 18:55:18",
   "seed_lat": 41.97917,
   "seed_lon": -15.91667,
   "seed_alt_m": 14220.0,
   "seed_age_h": 10.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 60.73265,
    "lon": 128.10655,
    "alt_m": 13932.4
   },
   "member_spread_deg": {
    "lat": 26.56,
    "lon": 57.33
   },
   "member_spread_now_deg": {
    "lat": 1.81,
    "lon": 5.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:54:00",
   "seed_lat": 27.625,
   "seed_lon": -158.79167,
   "seed_alt_m": 12970.0,
   "seed_age_h": 2.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 02:30:00",
    "lat": 41.02621,
    "lon": -55.16086,
    "alt_m": 13162.5
   },
   "member_spread_deg": {
    "lat": 23.72,
    "lon": 88.69
   },
   "member_spread_now_deg": {
    "lat": 1.57,
    "lon": 2.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-25",
   "flight_id": "DG2GG-25_2026-06-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 07:22:00",
   "seed_lat": 68.97917,
   "seed_lon": 68.16667,
   "seed_alt_m": 12990.0,
   "seed_age_h": 261.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 67.14785,
    "lon": 68.91121,
    "alt_m": 12653.1
   },
   "member_spread_deg": {
    "lat": 29.25,
    "lon": 342.81
   },
   "member_spread_now_deg": {
    "lat": 45.98,
    "lon": 204.07
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 01:23:00",
   "seed_lat": 37.0,
   "seed_lon": -138.5,
   "seed_alt_m": 13640.0,
   "seed_age_h": 3.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 01:00:00",
    "lat": 24.93877,
    "lon": -111.63857,
    "alt_m": 13924.7
   },
   "member_spread_deg": {
    "lat": 32.81,
    "lon": 99.55
   },
   "member_spread_now_deg": {
    "lat": 1.26,
    "lon": 0.99
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-29",
   "flight_id": "DG2GG-29_2026-07-28",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:57:00",
   "seed_lat": 46.91667,
   "seed_lon": 165.25,
   "seed_alt_m": 13380.0,
   "seed_age_h": 24.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 23.79184,
    "lon": -133.22841,
    "alt_m": 13713.7
   },
   "member_spread_deg": {
    "lat": 47.17,
    "lon": 345.61
   },
   "member_spread_now_deg": {
    "lat": 8.96,
    "lon": 14.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 14:41:00",
   "seed_lat": 30.70833,
   "seed_lon": -70.5,
   "seed_alt_m": 9190.0,
   "seed_age_h": 182.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 32.41469,
    "lon": 62.66118,
    "alt_m": 9107.4
   },
   "member_spread_deg": {
    "lat": 51.51,
    "lon": 318.21
   },
   "member_spread_now_deg": {
    "lat": 36.99,
    "lon": 130.28
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MMZ",
   "flight_id": "DL0MMZ_2026-07-24",
   "payload_type": "OTHER",
   "seed_time": "2026-07-25 15:59:04",
   "seed_lat": 36.60802,
   "seed_lon": 30.46457,
   "seed_alt_m": 8441.0,
   "seed_age_h": 253.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 28.92571,
    "lon": -47.70671,
    "alt_m": 8755.0
   },
   "member_spread_deg": {
    "lat": 36.43,
    "lon": 329.56
   },
   "member_spread_now_deg": {
    "lat": 29.76,
    "lon": 310.75
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:36:01",
   "seed_lat": 64.20833,
   "seed_lon": 58.16667,
   "seed_alt_m": 12170.0,
   "seed_age_h": 165.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 58.47074,
    "lon": -14.47955,
    "alt_m": 12450.9
   },
   "member_spread_deg": {
    "lat": 50.76,
    "lon": 334.24
   },
   "member_spread_now_deg": {
    "lat": 35.25,
    "lon": 354.7
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-29 07:27:02",
   "seed_lat": 64.15625,
   "seed_lon": 58.08889,
   "seed_alt_m": 12170.0,
   "seed_age_h": 165.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 60.58182,
    "lon": 65.33381,
    "alt_m": 12308.5
   },
   "member_spread_deg": {
    "lat": 29.54,
    "lon": 198.95
   },
   "member_spread_now_deg": {
    "lat": 36.0,
    "lon": 354.77
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 04:53:00",
   "seed_lat": 67.72917,
   "seed_lon": 153.70833,
   "seed_alt_m": 12120.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 05:00:00",
    "lat": 66.35602,
    "lon": 90.63308,
    "alt_m": 11892.5
   },
   "member_spread_deg": {
    "lat": 13.67,
    "lon": 171.25
   },
   "member_spread_now_deg": {
    "lat": 0.42,
    "lon": 0.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DO3GU-40",
   "flight_id": "DO3GU-40_2026-06-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-24 12:15:47",
   "seed_lat": 71.20833,
   "seed_lon": 93.16667,
   "seed_alt_m": 15164.0,
   "seed_age_h": 281.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 70.05143,
    "lon": -105.58163,
    "alt_m": 15087.3
   },
   "member_spread_deg": {
    "lat": 20.08,
    "lon": 348.33
   },
   "member_spread_now_deg": {
    "lat": 17.31,
    "lon": 308.99
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:23:00",
   "seed_lat": 73.125,
   "seed_lon": -140.66667,
   "seed_alt_m": 12950.0,
   "seed_age_h": 2.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 02:00:00",
    "lat": 55.53044,
    "lon": 28.447,
    "alt_m": 12844.0
   },
   "member_spread_deg": {
    "lat": 41.98,
    "lon": 172.93
   },
   "member_spread_now_deg": {
    "lat": 1.24,
    "lon": 5.32
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K0PEA-28",
   "flight_id": "K0PEA-28_2026-01-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 12:15:25",
   "seed_lat": 49.85411,
   "seed_lon": 24.91668,
   "seed_alt_m": 13360.0,
   "seed_age_h": 305.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 37.34549,
    "lon": -31.23151,
    "alt_m": 14095.5
   },
   "member_spread_deg": {
    "lat": 83.29,
    "lon": 287.94
   },
   "member_spread_now_deg": {
    "lat": 41.57,
    "lon": 342.43
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 04:55:37",
   "seed_lat": 41.62494,
   "seed_lon": 71.79167,
   "seed_alt_m": 12900.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:00:00",
    "lat": 32.71997,
    "lon": -154.58664,
    "alt_m": 13322.1
   },
   "member_spread_deg": {
    "lat": 61.7,
    "lon": 306.33
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.2
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:25:49",
   "seed_lat": 52.5833,
   "seed_lon": 125.16663,
   "seed_alt_m": 12840.0,
   "seed_age_h": 214.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 35.54236,
    "lon": -177.1451,
    "alt_m": 13203.3
   },
   "member_spread_deg": {
    "lat": 60.78,
    "lon": 325.29
   },
   "member_spread_now_deg": {
    "lat": 66.57,
    "lon": 314.73
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:47:18",
   "seed_lat": 50.85417,
   "seed_lon": -105.79167,
   "seed_alt_m": 13290.0,
   "seed_age_h": 2.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 02:15:00",
    "lat": 68.5775,
    "lon": 80.36399,
    "alt_m": 12972.6
   },
   "member_spread_deg": {
    "lat": 20.35,
    "lon": 165.28
   },
   "member_spread_now_deg": {
    "lat": 0.78,
    "lon": 0.6
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-28 09:08:18",
   "seed_lat": 50.14583,
   "seed_lon": 23.375,
   "seed_alt_m": 12850.0,
   "seed_age_h": 188.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 78.4482,
    "lon": -178.491,
    "alt_m": 12892.3
   },
   "member_spread_deg": {
    "lat": 26.46,
    "lon": 359.27
   },
   "member_spread_now_deg": {
    "lat": 28.42,
    "lon": 254.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 65.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 60.10262,
    "lon": 85.51445,
    "alt_m": 12432.2
   },
   "member_spread_deg": {
    "lat": 49.08,
    "lon": 257.73
   },
   "member_spread_now_deg": {
    "lat": 24.19,
    "lon": 44.47
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:20:00",
   "seed_lat": 51.08333,
   "seed_lon": -132.83333,
   "seed_alt_m": 12670.0,
   "seed_age_h": 3.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 01:45:00",
    "lat": 42.18094,
    "lon": 15.32515,
    "alt_m": 12601.0
   },
   "member_spread_deg": {
    "lat": 21.63,
    "lon": 108.27
   },
   "member_spread_now_deg": {
    "lat": 0.32,
    "lon": 0.64
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 22:11:00",
   "seed_lat": 52.41667,
   "seed_lon": -94.29167,
   "seed_alt_m": 12100.0,
   "seed_age_h": 7.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 52.47288,
    "lon": -90.02006,
    "alt_m": 12087.6
   },
   "member_spread_deg": {
    "lat": 7.79,
    "lon": 25.78
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 2.76
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 17:56:00",
   "seed_lat": 40.64583,
   "seed_lon": -14.54167,
   "seed_alt_m": 12440.0,
   "seed_age_h": 11.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 45.96382,
    "lon": 117.11519,
    "alt_m": 12136.2
   },
   "member_spread_deg": {
    "lat": 28.49,
    "lon": 75.83
   },
   "member_spread_now_deg": {
    "lat": 1.91,
    "lon": 3.33
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 22:55:27",
   "seed_lat": 23.95828,
   "seed_lon": -104.12496,
   "seed_alt_m": 12380.0,
   "seed_age_h": 78.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 38.8285,
    "lon": -106.7619,
    "alt_m": 12433.2
   },
   "member_spread_deg": {
    "lat": 40.15,
    "lon": 34.75
   },
   "member_spread_now_deg": {
    "lat": 11.82,
    "lon": 9.72
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 04:55:45",
   "seed_lat": 86.41661,
   "seed_lon": -161.04165,
   "seed_alt_m": 12840.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:00:00",
    "lat": 64.48596,
    "lon": 70.35373,
    "alt_m": 13196.1
   },
   "member_spread_deg": {
    "lat": 18.56,
    "lon": 55.62
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 2.9
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "PC4L-11",
   "flight_id": "PC4L-11_2026-07-16",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 12:46:26",
   "seed_lat": 42.93908,
   "seed_lon": 39.39383,
   "seed_alt_m": 11696.0,
   "seed_age_h": 232.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 33.001,
    "lon": -151.93977,
    "alt_m": 12265.7
   },
   "member_spread_deg": {
    "lat": 42.9,
    "lon": 303.04
   },
   "member_spread_now_deg": {
    "lat": 59.36,
    "lon": 332.96
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-07-25",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 13:19:17",
   "seed_lat": 44.85792,
   "seed_lon": 29.04891,
   "seed_alt_m": 13803.0,
   "seed_age_h": 232.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 66.76378,
    "lon": -19.51155,
    "alt_m": 13449.3
   },
   "member_spread_deg": {
    "lat": 30.14,
    "lon": 137.34
   },
   "member_spread_now_deg": {
    "lat": 30.27,
    "lon": 342.39
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-1",
   "flight_id": "SP2ROC-1_2026-03-14",
   "payload_type": "APRS",
   "seed_time": "2026-07-22 14:00:27",
   "seed_lat": 40.10083,
   "seed_lon": 44.614,
   "seed_alt_m": 14644.0,
   "seed_age_h": 327.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 41.79595,
    "lon": 132.68944,
    "alt_m": 14718.7
   },
   "member_spread_deg": {
    "lat": 59.91,
    "lon": 174.29
   },
   "member_spread_now_deg": {
    "lat": 29.28,
    "lon": 157.12
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 04:36:00",
   "seed_lat": 60.39583,
   "seed_lon": 103.83333,
   "seed_alt_m": 15540.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 04:00:00",
    "lat": 19.88165,
    "lon": 167.62458,
    "alt_m": 16443.3
   },
   "member_spread_deg": {
    "lat": 43.18,
    "lon": 328.77
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
   "seed_lat": 74.5625,
   "seed_lon": -160.0,
   "seed_alt_m": 12890.0,
   "seed_age_h": 106.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 66.22939,
    "lon": -167.13437,
    "alt_m": 13199.7
   },
   "member_spread_deg": {
    "lat": 19.25,
    "lon": 344.38
   },
   "member_spread_now_deg": {
    "lat": 31.28,
    "lon": 198.42
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP6MPL-9",
   "flight_id": "SP6MPL-9_2026-08-02",
   "payload_type": "APRS",
   "seed_time": "2026-08-04 04:05:45",
   "seed_lat": 45.52942,
   "seed_lon": 75.286,
   "seed_alt_m": 12836.0,
   "seed_age_h": 25.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": 48.01448,
    "lon": -132.73204,
    "alt_m": 13032.9
   },
   "member_spread_deg": {
    "lat": 29.73,
    "lon": 327.45
   },
   "member_spread_now_deg": {
    "lat": 10.12,
    "lon": 6.64
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 19:16:00",
   "seed_lat": 40.14583,
   "seed_lon": -25.45833,
   "seed_alt_m": 13510.0,
   "seed_age_h": 10.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 60.61283,
    "lon": 125.49109,
    "alt_m": 13219.7
   },
   "member_spread_deg": {
    "lat": 30.79,
    "lon": 39.45
   },
   "member_spread_now_deg": {
    "lat": 0.78,
    "lon": 2.48
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "YU9OMT-1",
   "flight_id": "YU9OMT-1_2026-05-24",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 12:50:00",
   "seed_lat": 39.60417,
   "seed_lon": 35.08336,
   "seed_alt_m": 11370.0,
   "seed_age_h": 232.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": 46.72344,
    "lon": -36.51648,
    "alt_m": 11649.0
   },
   "member_spread_deg": {
    "lat": 91.25,
    "lon": 280.93
   },
   "member_spread_now_deg": {
    "lat": 50.28,
    "lon": 353.31
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
   "seed_lat": -23.70833,
   "seed_lon": 149.29167,
   "seed_alt_m": 12380.0,
   "seed_age_h": 120.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 23:30:00",
    "lat": -9.06707,
    "lon": 32.83066,
    "alt_m": 12660.6
   },
   "member_spread_deg": {
    "lat": 16.8,
    "lon": 222.81
   },
   "member_spread_now_deg": {
    "lat": 23.7,
    "lon": 150.54
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
   "seed_lat": -7.75,
   "seed_lon": 8.375,
   "seed_alt_m": 13090.0,
   "seed_age_h": 206.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 23:45:00",
    "lat": -6.12696,
    "lon": -101.46863,
    "alt_m": 13095.2
   },
   "member_spread_deg": {
    "lat": 25.92,
    "lon": 330.89
   },
   "member_spread_now_deg": {
    "lat": 27.8,
    "lon": 309.71
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}