{
 "generated_utc": "2026-07-27T23:25:17Z",
 "gfs_cycle_utc": "2026-07-27T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 168.0,
  "output_interval_min": 30,
  "integration_step_s": 900,
  "wind_field_interval_h": 3
 },
 "staleness": {
  "fresh_seed_max_h": 24.0,
  "served_until_h": 168.0,
  "note": "A trajectory is served for seven days after the last real fix and then the flight disappears. 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."
 },
 "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_20260727_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260727_18Z.geojson.gz"
 },
 "counts": {
  "flights": 35,
  "members": 9,
  "rows": 105858
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:38:40",
   "seed_lat": -56.95834,
   "seed_lon": -9.49999,
   "seed_alt_m": 12360.0,
   "seed_age_h": 7.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 15:15:00",
    "lat": -44.01333,
    "lon": -93.33811,
    "alt_m": 12288.4
   },
   "member_spread_deg": {
    "lat": 28.84,
    "lon": 76.35
   }
  },
  {
   "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": 77.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 17:15:00",
    "lat": 72.4502,
    "lon": 146.81881,
    "alt_m": 12594.6
   },
   "member_spread_deg": {
    "lat": 21.24,
    "lon": 79.61
   }
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 18:28:18",
   "seed_lat": 44.97917,
   "seed_lon": -27.20833,
   "seed_alt_m": 12980.0,
   "seed_age_h": 4.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 18:00:00",
    "lat": 54.84969,
    "lon": 108.7381,
    "alt_m": 12779.5
   },
   "member_spread_deg": {
    "lat": 26.85,
    "lon": 42.81
   }
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:58:18",
   "seed_lat": 48.10417,
   "seed_lon": -119.5,
   "seed_alt_m": 14030.0,
   "seed_age_h": 0.36,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-03 23:00:00",
    "lat": 55.09867,
    "lon": 26.38707,
    "alt_m": 13936.1
   },
   "member_spread_deg": {
    "lat": 36.68,
    "lon": 144.44
   }
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:49:00",
   "seed_lat": 40.4375,
   "seed_lon": -160.08333,
   "seed_alt_m": 12890.0,
   "seed_age_h": 0.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 22:15:00",
    "lat": 48.85315,
    "lon": -79.73945,
    "alt_m": 12941.9
   },
   "member_spread_deg": {
    "lat": 24.17,
    "lon": 97.63
   }
  },
  {
   "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": 63.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-01 06:45:00",
    "lat": 82.96559,
    "lon": -74.69724,
    "alt_m": 12769.6
   },
   "member_spread_deg": {
    "lat": 38.11,
    "lon": 106.54
   }
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 08:58:00",
   "seed_lat": 56.29167,
   "seed_lon": 111.625,
   "seed_alt_m": 13140.0,
   "seed_age_h": 14.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 08:30:00",
    "lat": 48.12599,
    "lon": -157.94451,
    "alt_m": 12838.8
   },
   "member_spread_deg": {
    "lat": 50.02,
    "lon": 348.14
   }
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:51:00",
   "seed_lat": 31.08333,
   "seed_lon": -78.625,
   "seed_alt_m": 13750.0,
   "seed_age_h": 0.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 22:15:00",
    "lat": 40.22196,
    "lon": -108.97191,
    "alt_m": 13739.6
   },
   "member_spread_deg": {
    "lat": 36.65,
    "lon": 134.8
   }
  },
  {
   "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": 55.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-01 15:30:00",
    "lat": 55.63309,
    "lon": 116.74158,
    "alt_m": 8528.9
   },
   "member_spread_deg": {
    "lat": 20.23,
    "lon": 65.46
   }
  },
  {
   "callsign": "DL0MZ-493",
   "flight_id": "DL0MZ-493_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:01",
   "seed_lat": 49.625,
   "seed_lon": 25.08333,
   "seed_alt_m": 12400.0,
   "seed_age_h": 31.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 46.0047,
    "lon": -165.2625,
    "alt_m": 12586.4
   },
   "member_spread_deg": {
    "lat": 18.95,
    "lon": 355.78
   }
  },
  {
   "callsign": "DL0MZ-493e",
   "flight_id": "DL0MZ-493e_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:06:02",
   "seed_lat": 49.63134,
   "seed_lon": 25.11007,
   "seed_alt_m": 12400.0,
   "seed_age_h": 31.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 45.04643,
    "lon": -163.9853,
    "alt_m": 12608.8
   },
   "member_spread_deg": {
    "lat": 27.87,
    "lon": 356.11
   }
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 21:43:00",
   "seed_lat": 67.64583,
   "seed_lon": -42.41667,
   "seed_alt_m": 12380.0,
   "seed_age_h": 1.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 21:15:00",
    "lat": 63.77211,
    "lon": 69.86548,
    "alt_m": 12396.4
   },
   "member_spread_deg": {
    "lat": 25.2,
    "lon": 309.88
   }
  },
  {
   "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": 83.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 11:45:00",
    "lat": 63.99057,
    "lon": 175.66944,
    "alt_m": 14964.3
   },
   "member_spread_deg": {
    "lat": 14.47,
    "lon": 348.97
   }
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 06:03:00",
   "seed_lat": 52.6875,
   "seed_lon": 26.41667,
   "seed_alt_m": 12890.0,
   "seed_age_h": 17.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 05:30:00",
    "lat": 71.33927,
    "lon": -116.85148,
    "alt_m": 12890.7
   },
   "member_spread_deg": {
    "lat": 40.78,
    "lon": 327.27
   }
  },
  {
   "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": 107.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-30 11:45:00",
    "lat": 55.86863,
    "lon": 79.72506,
    "alt_m": 13625.6
   },
   "member_spread_deg": {
    "lat": 21.24,
    "lon": 333.61
   }
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 21:35:37",
   "seed_lat": 33.06244,
   "seed_lon": -74.95833,
   "seed_alt_m": 13300.0,
   "seed_age_h": 1.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 21:00:00",
    "lat": 37.07347,
    "lon": 55.27557,
    "alt_m": 13110.7
   },
   "member_spread_deg": {
    "lat": 32.55,
    "lon": 141.93
   }
  },
  {
   "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": 16.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 06:00:00",
    "lat": 25.22258,
    "lon": 132.80158,
    "alt_m": 13069.2
   },
   "member_spread_deg": {
    "lat": 37.4,
    "lon": 293.03
   }
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:50:18",
   "seed_lat": 79.66667,
   "seed_lon": 101.66667,
   "seed_alt_m": 13060.0,
   "seed_age_h": 0.5,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 22:15:00",
    "lat": 62.3986,
    "lon": -97.7751,
    "alt_m": 13268.9
   },
   "member_spread_deg": {
    "lat": 33.33,
    "lon": 157.77
   }
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 10:54:48",
   "seed_lat": 58.91667,
   "seed_lon": -3.41667,
   "seed_alt_m": 12700.0,
   "seed_age_h": 12.42,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 10:30:00",
    "lat": 53.65337,
    "lon": 76.20823,
    "alt_m": 12786.3
   },
   "member_spread_deg": {
    "lat": 17.63,
    "lon": 90.42
   }
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 19:30:43",
   "seed_lat": 50.16661,
   "seed_lon": -41.4583,
   "seed_alt_m": 13000.0,
   "seed_age_h": 3.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 19:00:00",
    "lat": 68.93166,
    "lon": 80.80905,
    "alt_m": 12899.1
   },
   "member_spread_deg": {
    "lat": 26.98,
    "lon": 76.39
   }
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:38:30",
   "seed_lat": 61.39583,
   "seed_lon": -144.33333,
   "seed_alt_m": 12260.0,
   "seed_age_h": 0.69,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 22:15:00",
    "lat": 48.55481,
    "lon": -120.8519,
    "alt_m": 12425.9
   },
   "member_spread_deg": {
    "lat": 20.07,
    "lon": 78.07
   }
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:25:27",
   "seed_lat": 45.60412,
   "seed_lon": -101.54163,
   "seed_alt_m": 12020.0,
   "seed_age_h": 0.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 22:00:00",
    "lat": 32.60316,
    "lon": -64.368,
    "alt_m": 12130.9
   },
   "member_spread_deg": {
    "lat": 11.01,
    "lon": 71.55
   }
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 21:35:45",
   "seed_lat": 58.83328,
   "seed_lon": -50.58331,
   "seed_alt_m": 13660.0,
   "seed_age_h": 1.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 21:00:00",
    "lat": 67.55446,
    "lon": 132.33283,
    "alt_m": 13363.4
   },
   "member_spread_deg": {
    "lat": 25.13,
    "lon": 118.4
   }
  },
  {
   "callsign": "N0MPM-31",
   "flight_id": "N0MPM-31_2026-04-16",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 23:53:19",
   "seed_lat": -24.02088,
   "seed_lon": -135.08331,
   "seed_alt_m": 14600.0,
   "seed_age_h": 143.45,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-28 23:30:00",
    "lat": -18.94604,
    "lon": 11.08316,
    "alt_m": 14558.7
   },
   "member_spread_deg": {
    "lat": 31.04,
    "lon": 113.53
   }
  },
  {
   "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": 34.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 24.93557,
    "lon": 112.34263,
    "alt_m": 12153.6
   },
   "member_spread_deg": {
    "lat": 42.68,
    "lon": 335.68
   }
  },
  {
   "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": 34.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:45:00",
    "lat": 59.78799,
    "lon": 153.19704,
    "alt_m": 13738.0
   },
   "member_spread_deg": {
    "lat": 15.38,
    "lon": 72.38
   }
  },
  {
   "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": 129.33,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-29 13:30:00",
    "lat": 21.44687,
    "lon": 74.2525,
    "alt_m": 14870.6
   },
   "member_spread_deg": {
    "lat": 33.94,
    "lon": 51.67
   }
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 17:46:00",
   "seed_lat": 50.97917,
   "seed_lon": -22.08333,
   "seed_alt_m": 15660.0,
   "seed_age_h": 5.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 17:15:00",
    "lat": 77.07313,
    "lon": 59.72433,
    "alt_m": 15301.4
   },
   "member_spread_deg": {
    "lat": 15.52,
    "lon": 138.81
   }
  },
  {
   "callsign": "SP6MPL-32",
   "flight_id": "SP6MPL-32_2026-01-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 03:17:00",
   "seed_lat": -22.31248,
   "seed_lon": 162.875,
   "seed_alt_m": 14160.0,
   "seed_age_h": 164.05,
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   "dead_reckoned": true,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-07-28 02:45:00",
    "lat": -12.46258,
    "lon": -109.34655,
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   },
   "member_spread_deg": {
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    "lon": 350.02
   }
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:42:00",
   "seed_lat": 65.91666,
   "seed_lon": 174.58333,
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   "seed_age_h": 0.63,
   "float_reliable": true,
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   "nominal_end": {
    "valid_time": "2026-08-03 22:15:00",
    "lat": 52.41258,
    "lon": -158.64635,
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   "member_spread_deg": {
    "lat": 44.73,
    "lon": 161.27
   }
  },
  {
   "callsign": "W0DLK-1",
   "flight_id": "W0DLK-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-21 06:43:47",
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   "seed_lon": 121.75004,
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   "float_reliable": true,
   "dead_reckoned": true,
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   "nominal_end": {
    "valid_time": "2026-07-28 06:15:00",
    "lat": 40.65906,
    "lon": -165.28812,
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   },
   "member_spread_deg": {
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    "lon": 343.98
   }
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 22:55:23",
   "seed_lat": 38.52078,
   "seed_lon": 145.62503,
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   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-03 23:00:00",
    "lat": 28.90759,
    "lon": -98.08731,
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   },
   "member_spread_deg": {
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    "lon": 322.94
   }
  },
  {
   "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": 34.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 47.47837,
    "lon": 108.5378,
    "alt_m": 11536.2
   },
   "member_spread_deg": {
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    "lon": 63.4
   }
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 14:19:00",
   "seed_lat": -23.25,
   "seed_lon": 17.04167,
   "seed_alt_m": 12190.0,
   "seed_age_h": 9.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-03 13:45:00",
    "lat": -14.63967,
    "lon": -57.28571,
    "alt_m": 12524.2
   },
   "member_spread_deg": {
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    "lon": 97.62
   }
  },
  {
   "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": 8.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 14:45:00",
    "lat": -20.85006,
    "lon": -109.70703,
    "alt_m": 12944.4
   },
   "member_spread_deg": {
    "lat": 14.57,
    "lon": 273.28
   }
  }
 ]
}