{
 "generated_utc": "2026-08-08T17:27:16Z",
 "gfs_cycle_utc": "2026-08-08T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 479.0,
  "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_20260808_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260808_12Z.geojson.gz"
 },
 "counts": {
  "flights": 31,
  "members": 9,
  "rows": 157257
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 06:43:40",
   "seed_lat": -56.79167,
   "seed_lon": 124.33334,
   "seed_alt_m": 12300.0,
   "seed_age_h": 10.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": -56.27753,
    "lon": 59.91528,
    "alt_m": 12418.3
   },
   "member_spread_deg": {
    "lat": 14.58,
    "lon": 90.96
   },
   "member_spread_now_deg": {
    "lat": 2.53,
    "lon": 3.29
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:56:18",
   "seed_lat": 55.10417,
   "seed_lon": -63.70833,
   "seed_alt_m": 12950.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 17:00:00",
    "lat": 68.34904,
    "lon": 63.02386,
    "alt_m": 12837.1
   },
   "member_spread_deg": {
    "lat": 23.52,
    "lon": 35.39
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.27
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:39:49",
   "seed_lat": 43.125,
   "seed_lon": 58.66667,
   "seed_alt_m": 14040.0,
   "seed_age_h": 6.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 35.8001,
    "lon": 150.40131,
    "alt_m": 14429.1
   },
   "member_spread_deg": {
    "lat": 18.56,
    "lon": 293.51
   },
   "member_spread_now_deg": {
    "lat": 1.23,
    "lon": 0.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:24:00",
   "seed_lat": 43.91667,
   "seed_lon": -94.08333,
   "seed_alt_m": 12840.0,
   "seed_age_h": 0.93,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 16:00:00",
    "lat": 31.06926,
    "lon": -46.05772,
    "alt_m": 12991.7
   },
   "member_spread_deg": {
    "lat": 33.54,
    "lon": 144.49
   },
   "member_spread_now_deg": {
    "lat": 0.38,
    "lon": 0.12
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:10:30",
   "seed_lat": 26.29167,
   "seed_lon": -106.54167,
   "seed_alt_m": 13907.0,
   "seed_age_h": 1.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-15 15:45:00",
    "lat": 16.52624,
    "lon": -114.24197,
    "alt_m": 13897.7
   },
   "member_spread_deg": {
    "lat": 42.56,
    "lon": 44.71
   },
   "member_spread_now_deg": {
    "lat": 0.32,
    "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": 108.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 34.11972,
    "lon": -32.31474,
    "alt_m": 13654.8
   },
   "member_spread_deg": {
    "lat": 72.72,
    "lon": 266.33
   },
   "member_spread_now_deg": {
    "lat": 46.21,
    "lon": 334.89
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 266.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 18.49868,
    "lon": 106.57309,
    "alt_m": 9052.3
   },
   "member_spread_deg": {
    "lat": 28.9,
    "lon": 309.55
   },
   "member_spread_now_deg": {
    "lat": 19.45,
    "lon": 138.19
   },
   "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": 249.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 48.62323,
    "lon": 55.94538,
    "alt_m": 11929.5
   },
   "member_spread_deg": {
    "lat": 46.32,
    "lon": 224.48
   },
   "member_spread_now_deg": {
    "lat": 54.73,
    "lon": 172.83
   },
   "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": 249.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 30.40629,
    "lon": -80.68317,
    "alt_m": 12802.1
   },
   "member_spread_deg": {
    "lat": 49.53,
    "lon": 210.15
   },
   "member_spread_now_deg": {
    "lat": 48.31,
    "lon": 95.14
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:53:00",
   "seed_lat": 61.95833,
   "seed_lon": -46.29167,
   "seed_alt_m": 12390.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 17:00:00",
    "lat": 63.37092,
    "lon": 77.7514,
    "alt_m": 12553.7
   },
   "member_spread_deg": {
    "lat": 21.81,
    "lon": 84.98
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:53:00",
   "seed_lat": 67.91667,
   "seed_lon": -125.29167,
   "seed_alt_m": 12840.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 17:00:00",
    "lat": 72.89993,
    "lon": -85.57197,
    "alt_m": 12322.4
   },
   "member_spread_deg": {
    "lat": 13.37,
    "lon": 27.76
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.21
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 01:55:37",
   "seed_lat": 46.16661,
   "seed_lon": 129.125,
   "seed_alt_m": 13010.0,
   "seed_age_h": 39.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 23.16084,
    "lon": -176.60633,
    "alt_m": 13437.3
   },
   "member_spread_deg": {
    "lat": 38.26,
    "lon": 147.93
   },
   "member_spread_now_deg": {
    "lat": 17.58,
    "lon": 359.37
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 298.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 29.88501,
    "lon": -141.00327,
    "alt_m": 13140.2
   },
   "member_spread_deg": {
    "lat": 59.58,
    "lon": 314.26
   },
   "member_spread_now_deg": {
    "lat": 71.57,
    "lon": 262.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:46:33",
   "seed_lat": 57.70833,
   "seed_lon": -53.91667,
   "seed_alt_m": 13442.0,
   "seed_age_h": 0.56,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 16:15:00",
    "lat": 71.80208,
    "lon": 26.74585,
    "alt_m": 13207.0
   },
   "member_spread_deg": {
    "lat": 23.83,
    "lon": 52.16
   },
   "member_spread_now_deg": {
    "lat": 0.06,
    "lon": 0.23
   },
   "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": 272.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 51.25794,
    "lon": -82.3332,
    "alt_m": 13098.1
   },
   "member_spread_deg": {
    "lat": 50.99,
    "lon": 257.22
   },
   "member_spread_now_deg": {
    "lat": 24.2,
    "lon": 281.93
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:45:43",
   "seed_lat": 69.20828,
   "seed_lon": -32.66664,
   "seed_alt_m": 12600.0,
   "seed_age_h": 0.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 16:15:00",
    "lat": 50.16832,
    "lon": 51.91889,
    "alt_m": 12539.5
   },
   "member_spread_deg": {
    "lat": 22.69,
    "lon": 102.57
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:25:00",
   "seed_lat": 36.02083,
   "seed_lon": -43.16667,
   "seed_alt_m": 13050.0,
   "seed_age_h": 0.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 16:00:00",
    "lat": 39.86251,
    "lon": 13.1636,
    "alt_m": 12759.1
   },
   "member_spread_deg": {
    "lat": 3.37,
    "lon": 18.09
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:43:30",
   "seed_lat": 63.41667,
   "seed_lon": -99.16667,
   "seed_alt_m": 12080.0,
   "seed_age_h": 0.61,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 16:15:00",
    "lat": 69.88988,
    "lon": -27.41655,
    "alt_m": 12056.1
   },
   "member_spread_deg": {
    "lat": 10.54,
    "lon": 54.64
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 11:06:00",
   "seed_lat": 45.60417,
   "seed_lon": 28.54167,
   "seed_alt_m": 12090.0,
   "seed_age_h": 30.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 38.46302,
    "lon": -138.54593,
    "alt_m": 12403.9
   },
   "member_spread_deg": {
    "lat": 16.38,
    "lon": 306.0
   },
   "member_spread_now_deg": {
    "lat": 11.17,
    "lon": 24.1
   },
   "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": 162.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 0.2542,
    "lon": -77.30675,
    "alt_m": 12380.4
   },
   "member_spread_deg": {
    "lat": 18.8,
    "lon": 66.22
   },
   "member_spread_now_deg": {
    "lat": 15.59,
    "lon": 10.77
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:55:45",
   "seed_lat": 61.24995,
   "seed_lon": -39.33331,
   "seed_alt_m": 13240.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 17:00:00",
    "lat": 71.95114,
    "lon": 110.7052,
    "alt_m": 13406.4
   },
   "member_spread_deg": {
    "lat": 19.36,
    "lon": 299.38
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.16
   },
   "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": 316.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 41.8623,
    "lon": -85.19417,
    "alt_m": 12267.6
   },
   "member_spread_deg": {
    "lat": 55.2,
    "lon": 342.26
   },
   "member_spread_now_deg": {
    "lat": 55.88,
    "lon": 333.27
   },
   "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": 316.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 67.1626,
    "lon": 2.90526,
    "alt_m": 13350.1
   },
   "member_spread_deg": {
    "lat": 80.28,
    "lon": 252.58
   },
   "member_spread_now_deg": {
    "lat": 36.81,
    "lon": 275.13
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 06:48:00",
   "seed_lat": 63.0,
   "seed_lon": 153.125,
   "seed_alt_m": 15660.0,
   "seed_age_h": 10.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 15.79624,
    "lon": 167.78514,
    "alt_m": 16546.8
   },
   "member_spread_deg": {
    "lat": 69.96,
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   },
   "member_spread_now_deg": {
    "lat": 2.17,
    "lon": 13.65
   },
   "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": 190.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 38.68936,
    "lon": -76.43386,
    "alt_m": 13520.0
   },
   "member_spread_deg": {
    "lat": 45.38,
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   },
   "member_spread_now_deg": {
    "lat": 28.98,
    "lon": 310.91
   },
   "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": 109.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 50.45393,
    "lon": 38.44193,
    "alt_m": 12791.5
   },
   "member_spread_deg": {
    "lat": 25.43,
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   },
   "member_spread_now_deg": {
    "lat": 22.18,
    "lon": 356.78
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 04:11:00",
   "seed_lat": 42.47917,
   "seed_lon": 63.20833,
   "seed_alt_m": 13050.0,
   "seed_age_h": 13.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 28.83966,
    "lon": 129.53461,
    "alt_m": 13462.8
   },
   "member_spread_deg": {
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    "lon": 320.71
   },
   "member_spread_now_deg": {
    "lat": 1.15,
    "lon": 3.18
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 12:02:53",
   "seed_lat": 45.06245,
   "seed_lon": 63.33336,
   "seed_alt_m": 13480.0,
   "seed_age_h": 5.29,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": 25.19983,
    "lon": 168.04991,
    "alt_m": 14092.3
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
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   },
   "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": 316.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": 63.98317,
    "lon": 18.5599,
    "alt_m": 11353.4
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 68.14,
    "lon": 308.87
   },
   "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": 204.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 11:30:00",
    "lat": -25.7066,
    "lon": 173.93436,
    "alt_m": 12466.1
   },
   "member_spread_deg": {
    "lat": 23.09,
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   },
   "member_spread_now_deg": {
    "lat": 24.48,
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   },
   "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": 290.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 11:45:00",
    "lat": -6.6508,
    "lon": -18.66677,
    "alt_m": 13144.0
   },
   "member_spread_deg": {
    "lat": 40.34,
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   },
   "member_spread_now_deg": {
    "lat": 27.19,
    "lon": 252.54
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}