{
 "generated_utc": "2026-08-06T17:27:32Z",
 "gfs_cycle_utc": "2026-08-06T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 479.5,
  "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_20260806_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260806_12Z.geojson.gz"
 },
 "counts": {
  "flights": 34,
  "members": 9,
  "rows": 174915
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 14:33:40",
   "seed_lat": -44.375,
   "seed_lon": 29.08335,
   "seed_alt_m": 12660.0,
   "seed_age_h": 2.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 14:00:00",
    "lat": -36.62946,
    "lon": -147.92289,
    "alt_m": 12914.0
   },
   "member_spread_deg": {
    "lat": 27.18,
    "lon": 105.25
   },
   "member_spread_now_deg": {
    "lat": 0.42,
    "lon": 0.67
   },
   "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": 311.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 60.19197,
    "lon": -122.35179,
    "alt_m": 13038.0
   },
   "member_spread_deg": {
    "lat": 65.48,
    "lon": 240.58
   },
   "member_spread_now_deg": {
    "lat": 55.47,
    "lon": 87.89
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:54:47",
   "seed_lat": 57.25,
   "seed_lon": -119.04167,
   "seed_alt_m": 12780.0,
   "seed_age_h": 0.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:00:00",
    "lat": 59.75428,
    "lon": -0.7519,
    "alt_m": 12646.4
   },
   "member_spread_deg": {
    "lat": 18.42,
    "lon": 148.3
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 0.35
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 09:15:03",
   "seed_lat": 58.04167,
   "seed_lon": 26.125,
   "seed_alt_m": 13940.0,
   "seed_age_h": 8.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 48.72169,
    "lon": 153.60209,
    "alt_m": 14289.0
   },
   "member_spread_deg": {
    "lat": 39.63,
    "lon": 326.38
   },
   "member_spread_now_deg": {
    "lat": 0.74,
    "lon": 7.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 02:49:00",
   "seed_lat": 32.41667,
   "seed_lon": -153.20833,
   "seed_alt_m": 13120.0,
   "seed_age_h": 14.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 49.28446,
    "lon": 0.6173,
    "alt_m": 13029.8
   },
   "member_spread_deg": {
    "lat": 48.16,
    "lon": 165.48
   },
   "member_spread_now_deg": {
    "lat": 1.86,
    "lon": 5.66
   },
   "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": 297.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 78.93995,
    "lon": 40.0799,
    "alt_m": 12326.1
   },
   "member_spread_deg": {
    "lat": 53.15,
    "lon": 329.58
   },
   "member_spread_now_deg": {
    "lat": 32.59,
    "lon": 214.7
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:53:00",
   "seed_lat": 40.85417,
   "seed_lon": -104.5,
   "seed_alt_m": 13830.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:00:00",
    "lat": 8.71143,
    "lon": -126.66488,
    "alt_m": 14086.3
   },
   "member_spread_deg": {
    "lat": 38.15,
    "lon": 44.05
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.2
   },
   "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": 60.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 42.47329,
    "lon": -122.55331,
    "alt_m": 13346.3
   },
   "member_spread_deg": {
    "lat": 76.85,
    "lon": 317.87
   },
   "member_spread_now_deg": {
    "lat": 21.29,
    "lon": 22.61
   },
   "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": 218.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 39.52378,
    "lon": 75.76645,
    "alt_m": 9096.6
   },
   "member_spread_deg": {
    "lat": 36.18,
    "lon": 320.14
   },
   "member_spread_now_deg": {
    "lat": 43.07,
    "lon": 147.61
   },
   "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": 289.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 50.78612,
    "lon": 4.91075,
    "alt_m": 8757.0
   },
   "member_spread_deg": {
    "lat": 49.56,
    "lon": 348.58
   },
   "member_spread_now_deg": {
    "lat": 45.8,
    "lon": 327.51
   },
   "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": 201.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 44.39866,
    "lon": 45.51529,
    "alt_m": 12355.6
   },
   "member_spread_deg": {
    "lat": 45.64,
    "lon": 312.22
   },
   "member_spread_now_deg": {
    "lat": 38.7,
    "lon": 108.73
   },
   "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": 201.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 27.37688,
    "lon": -92.0786,
    "alt_m": 12757.4
   },
   "member_spread_deg": {
    "lat": 42.14,
    "lon": 99.22
   },
   "member_spread_now_deg": {
    "lat": 37.74,
    "lon": 56.78
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:53:00",
   "seed_lat": 84.5,
   "seed_lon": -36.83333,
   "seed_alt_m": 12120.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:00:00",
    "lat": 64.83589,
    "lon": -60.08591,
    "alt_m": 11920.5
   },
   "member_spread_deg": {
    "lat": 22.72,
    "lon": 283.33
   },
   "member_spread_now_deg": {
    "lat": 0.25,
    "lon": 0.74
   },
   "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": 317.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 66.79056,
    "lon": -96.74042,
    "alt_m": 15093.5
   },
   "member_spread_deg": {
    "lat": 25.47,
    "lon": 349.5
   },
   "member_spread_now_deg": {
    "lat": 23.94,
    "lon": 344.67
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:20:30",
   "seed_lat": 62.95833,
   "seed_lon": -131.29167,
   "seed_alt_m": 13070.0,
   "seed_age_h": 0.99,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 15:45:00",
    "lat": 68.5354,
    "lon": -116.74411,
    "alt_m": 12737.0
   },
   "member_spread_deg": {
    "lat": 24.71,
    "lon": 187.68
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.66
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 07:15:37",
   "seed_lat": 53.91661,
   "seed_lon": 105.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 10.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 33.21734,
    "lon": -144.76931,
    "alt_m": 13411.3
   },
   "member_spread_deg": {
    "lat": 51.84,
    "lon": 352.35
   },
   "member_spread_now_deg": {
    "lat": 2.74,
    "lon": 3.74
   },
   "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": 250.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 12.42376,
    "lon": -173.48756,
    "alt_m": 13242.1
   },
   "member_spread_deg": {
    "lat": 54.77,
    "lon": 321.44
   },
   "member_spread_now_deg": {
    "lat": 70.57,
    "lon": 288.09
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:57:03",
   "seed_lat": 55.58333,
   "seed_lon": -76.83333,
   "seed_alt_m": 13340.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:00:00",
    "lat": 64.84999,
    "lon": -14.10033,
    "alt_m": 13299.1
   },
   "member_spread_deg": {
    "lat": 10.91,
    "lon": 68.59
   },
   "member_spread_now_deg": {
    "lat": 0.1,
    "lon": 0.24
   },
   "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": 224.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 60.22935,
    "lon": -115.85228,
    "alt_m": 13091.1
   },
   "member_spread_deg": {
    "lat": 29.45,
    "lon": 296.64
   },
   "member_spread_now_deg": {
    "lat": 22.19,
    "lon": 282.64
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 01:55:43",
   "seed_lat": 77.04161,
   "seed_lon": 175.7917,
   "seed_alt_m": 12360.0,
   "seed_age_h": 15.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 68.90009,
    "lon": 68.57148,
    "alt_m": 12653.6
   },
   "member_spread_deg": {
    "lat": 21.19,
    "lon": 320.62
   },
   "member_spread_now_deg": {
    "lat": 10.23,
    "lon": 152.08
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:00:00",
   "seed_lat": 44.60417,
   "seed_lon": -83.29167,
   "seed_alt_m": 12800.0,
   "seed_age_h": 1.33,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 15:30:00",
    "lat": 40.95398,
    "lon": 11.12084,
    "alt_m": 12742.9
   },
   "member_spread_deg": {
    "lat": 44.12,
    "lon": 130.13
   },
   "member_spread_now_deg": {
    "lat": 0.3,
    "lon": 1.5
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:43:30",
   "seed_lat": 61.83333,
   "seed_lon": -80.54167,
   "seed_alt_m": 12100.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 16:15:00",
    "lat": 54.23531,
    "lon": -74.83602,
    "alt_m": 12026.2
   },
   "member_spread_deg": {
    "lat": 19.9,
    "lon": 102.02
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 15:31:00",
   "seed_lat": 38.9375,
   "seed_lon": 14.83333,
   "seed_alt_m": 12250.0,
   "seed_age_h": 1.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 15:00:00",
    "lat": 46.25178,
    "lon": 151.64674,
    "alt_m": 12507.2
   },
   "member_spread_deg": {
    "lat": 16.51,
    "lon": 43.13
   },
   "member_spread_now_deg": {
    "lat": 1.07,
    "lon": 0.28
   },
   "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": 114.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 1.08168,
    "lon": -90.18251,
    "alt_m": 12345.0
   },
   "member_spread_deg": {
    "lat": 24.73,
    "lon": 73.21
   },
   "member_spread_now_deg": {
    "lat": 16.32,
    "lon": 5.12
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 16:55:45",
   "seed_lat": 75.58328,
   "seed_lon": -24.79165,
   "seed_alt_m": 13060.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:00:00",
    "lat": 74.23174,
    "lon": 88.60131,
    "alt_m": 13242.7
   },
   "member_spread_deg": {
    "lat": 34.79,
    "lon": 111.9
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.35
   },
   "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": 268.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 31.5539,
    "lon": -133.85345,
    "alt_m": 12253.8
   },
   "member_spread_deg": {
    "lat": 33.26,
    "lon": 283.65
   },
   "member_spread_now_deg": {
    "lat": 53.28,
    "lon": 321.74
   },
   "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": 268.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 64.68562,
    "lon": -59.83007,
    "alt_m": 13338.5
   },
   "member_spread_deg": {
    "lat": 55.88,
    "lon": 272.97
   },
   "member_spread_now_deg": {
    "lat": 46.44,
    "lon": 342.51
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 08:26:00",
   "seed_lat": 54.29167,
   "seed_lon": 125.45833,
   "seed_alt_m": 15600.0,
   "seed_age_h": 8.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 78.7872,
    "lon": -175.92849,
    "alt_m": 15237.5
   },
   "member_spread_deg": {
    "lat": 77.46,
    "lon": 355.27
   },
   "member_spread_now_deg": {
    "lat": 1.47,
    "lon": 5.98
   },
   "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": 142.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 51.15799,
    "lon": -119.72671,
    "alt_m": 13294.1
   },
   "member_spread_deg": {
    "lat": 33.36,
    "lon": 345.49
   },
   "member_spread_now_deg": {
    "lat": 33.61,
    "lon": 176.77
   },
   "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": 61.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 47.2403,
    "lon": -27.10431,
    "alt_m": 12875.4
   },
   "member_spread_deg": {
    "lat": 25.16,
    "lon": 275.56
   },
   "member_spread_now_deg": {
    "lat": 23.53,
    "lon": 55.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 10:31:00",
   "seed_lat": 59.08333,
   "seed_lon": 27.75,
   "seed_alt_m": 13040.0,
   "seed_age_h": 6.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": 34.73273,
    "lon": 143.51885,
    "alt_m": 13313.8
   },
   "member_spread_deg": {
    "lat": 30.92,
    "lon": 31.44
   },
   "member_spread_now_deg": {
    "lat": 0.98,
    "lon": 5.19
   },
   "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": 268.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 50.5482,
    "lon": -24.58202,
    "alt_m": 11565.1
   },
   "member_spread_deg": {
    "lat": 74.71,
    "lon": 288.66
   },
   "member_spread_now_deg": {
    "lat": 54.79,
    "lon": 355.07
   },
   "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": 156.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 11:30:00",
    "lat": -31.23841,
    "lon": 73.59585,
    "alt_m": 12342.4
   },
   "member_spread_deg": {
    "lat": 23.28,
    "lon": 239.21
   },
   "member_spread_now_deg": {
    "lat": 16.07,
    "lon": 176.63
   },
   "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": 242.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 11:45:00",
    "lat": 0.55423,
    "lon": -59.58427,
    "alt_m": 13116.3
   },
   "member_spread_deg": {
    "lat": 28.42,
    "lon": 291.88
   },
   "member_spread_now_deg": {
    "lat": 24.01,
    "lon": 259.42
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}