{
 "generated_utc": "2026-07-27T01:48:34Z",
 "gfs_cycle_utc": "2026-07-26T18:00:00Z",
 "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_20260726_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260726_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": "2026-07-26 18:53:40",
   "seed_lat": -54.79167,
   "seed_lon": -53.16665,
   "seed_alt_m": 12420.0,
   "seed_age_h": 6.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 18:30:00",
    "lat": -44.39821,
    "lon": -100.32475,
    "alt_m": 12360.1
   },
   "member_spread_deg": {
    "lat": 36.17,
    "lon": 345.94
   }
  },
  {
   "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": 56.06,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 17:15:00",
    "lat": 66.74215,
    "lon": 163.57027,
    "alt_m": 12924.9
   },
   "member_spread_deg": {
    "lat": 14.57,
    "lon": 82.32
   }
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 18:51:19",
   "seed_lat": 45.72917,
   "seed_lon": -35.83333,
   "seed_alt_m": 13110.0,
   "seed_age_h": 6.86,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 18:15:00",
    "lat": 63.97588,
    "lon": 94.24034,
    "alt_m": 12979.8
   },
   "member_spread_deg": {
    "lat": 30.94,
    "lon": 84.03
   }
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 00:53:33",
   "seed_lat": 40.58333,
   "seed_lon": -134.70833,
   "seed_alt_m": 14020.0,
   "seed_age_h": 0.83,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-03 00:30:00",
    "lat": 26.80559,
    "lon": -38.84903,
    "alt_m": 14519.7
   },
   "member_spread_deg": {
    "lat": 31.68,
    "lon": 108.03
   }
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 00:34:00",
   "seed_lat": 54.875,
   "seed_lon": -172.04167,
   "seed_alt_m": 13000.0,
   "seed_age_h": 1.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 00:00:00",
    "lat": 25.31593,
    "lon": -164.34035,
    "alt_m": 13205.3
   },
   "member_spread_deg": {
    "lat": 22.43,
    "lon": 355.54
   }
  },
  {
   "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": 42.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-01 06:45:00",
    "lat": 84.1792,
    "lon": -62.54066,
    "alt_m": 12650.1
   },
   "member_spread_deg": {
    "lat": 30.03,
    "lon": 75.31
   }
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 11:28:00",
   "seed_lat": 49.54167,
   "seed_lon": 89.875,
   "seed_alt_m": 13040.0,
   "seed_age_h": 14.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 11:00:00",
    "lat": 43.17016,
    "lon": 173.06499,
    "alt_m": 13885.4
   },
   "member_spread_deg": {
    "lat": 22.19,
    "lon": 352.46
   }
  },
  {
   "callsign": "DJ2DS-34",
   "flight_id": "DJ2DS-34_2026-04-22",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 01:03:30",
   "seed_lat": 51.79167,
   "seed_lon": -99.29167,
   "seed_alt_m": 12785.0,
   "seed_age_h": 0.66,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 00:30:00",
    "lat": 36.63698,
    "lon": 13.57785,
    "alt_m": 12897.5
   },
   "member_spread_deg": {
    "lat": 37.13,
    "lon": 192.37
   }
  },
  {
   "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": 33.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-01 15:30:00",
    "lat": 51.04275,
    "lon": 139.1339,
    "alt_m": 8478.2
   },
   "member_spread_deg": {
    "lat": 17.99,
    "lon": 345.81
   }
  },
  {
   "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": 9.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 61.28902,
    "lon": 142.89199,
    "alt_m": 12242.1
   },
   "member_spread_deg": {
    "lat": 11.34,
    "lon": 321.52
   }
  },
  {
   "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": 9.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:30:00",
    "lat": 61.91504,
    "lon": 139.53556,
    "alt_m": 12259.0
   },
   "member_spread_deg": {
    "lat": 23.67,
    "lon": 319.96
   }
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 22:43:00",
   "seed_lat": 77.60417,
   "seed_lon": -59.33333,
   "seed_alt_m": 12150.0,
   "seed_age_h": 3.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 22:15:00",
    "lat": 67.7699,
    "lon": 150.72631,
    "alt_m": 12305.6
   },
   "member_spread_deg": {
    "lat": 11.33,
    "lon": 157.46
   }
  },
  {
   "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": 61.46,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-31 11:45:00",
    "lat": 61.32661,
    "lon": 164.35591,
    "alt_m": 15076.0
   },
   "member_spread_deg": {
    "lat": 32.89,
    "lon": 334.79
   }
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:10:30",
   "seed_lat": 50.375,
   "seed_lon": 19.75,
   "seed_alt_m": 13020.0,
   "seed_age_h": 9.54,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 15:45:00",
    "lat": 62.80669,
    "lon": -156.80226,
    "alt_m": 12850.0
   },
   "member_spread_deg": {
    "lat": 30.98,
    "lon": 347.72
   }
  },
  {
   "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": 85.46,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-30 11:45:00",
    "lat": 54.08854,
    "lon": 83.18174,
    "alt_m": 13587.8
   },
   "member_spread_deg": {
    "lat": 18.0,
    "lon": 307.03
   }
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 22:55:37",
   "seed_lat": 52.93744,
   "seed_lon": -105.16667,
   "seed_alt_m": 12810.0,
   "seed_age_h": 2.79,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 22:30:00",
    "lat": 22.98859,
    "lon": -35.52008,
    "alt_m": 13298.6
   },
   "member_spread_deg": {
    "lat": 28.93,
    "lon": 170.79
   }
  },
  {
   "callsign": "K9YO-23",
   "flight_id": "K9YO-23_2026-07-13",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 01:25:49",
   "seed_lat": 53.60413,
   "seed_lon": 119.87496,
   "seed_alt_m": 12740.0,
   "seed_age_h": 0.29,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 01:30:00",
    "lat": 28.78065,
    "lon": 119.47362,
    "alt_m": 13136.4
   },
   "member_spread_deg": {
    "lat": 36.72,
    "lon": 303.86
   }
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 01:31:33",
   "seed_lat": 78.5625,
   "seed_lon": 39.91667,
   "seed_alt_m": 13020.0,
   "seed_age_h": 0.19,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 01:30:00",
    "lat": 77.82285,
    "lon": -98.18225,
    "alt_m": 13109.7
   },
   "member_spread_deg": {
    "lat": 35.63,
    "lon": 185.09
   }
  },
  {
   "callsign": "KC3LBR-485",
   "flight_id": "KC3LBR-485_2026-03-19",
   "payload_type": "WSPR",
   "seed_time": "2026-07-23 17:57:03",
   "seed_lat": 54.97917,
   "seed_lon": -79.79167,
   "seed_alt_m": 12610.0,
   "seed_age_h": 79.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-30 17:30:00",
    "lat": 53.50059,
    "lon": 48.54403,
    "alt_m": 12669.2
   },
   "member_spread_deg": {
    "lat": 30.05,
    "lon": 120.61
   }
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 20:15:43",
   "seed_lat": 57.89578,
   "seed_lon": -51.79163,
   "seed_alt_m": 13030.0,
   "seed_age_h": 5.46,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 19:45:00",
    "lat": 53.02727,
    "lon": 93.66464,
    "alt_m": 12918.5
   },
   "member_spread_deg": {
    "lat": 34.49,
    "lon": 91.78
   }
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 01:11:00",
   "seed_lat": 63.1875,
   "seed_lon": -154.29167,
   "seed_alt_m": 12540.0,
   "seed_age_h": 0.54,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-03 00:45:00",
    "lat": 52.29449,
    "lon": -83.46369,
    "alt_m": 12381.0
   },
   "member_spread_deg": {
    "lat": 26.29,
    "lon": 75.02
   }
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 23:55:27",
   "seed_lat": 32.77079,
   "seed_lon": -118.2083,
   "seed_alt_m": 12230.0,
   "seed_age_h": 1.79,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 23:30:00",
    "lat": 37.68846,
    "lon": -130.50982,
    "alt_m": 12237.2
   },
   "member_spread_deg": {
    "lat": 17.19,
    "lon": 37.3
   }
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 22:35:45",
   "seed_lat": 53.31245,
   "seed_lon": -64.41665,
   "seed_alt_m": 13540.0,
   "seed_age_h": 3.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 22:00:00",
    "lat": 74.80776,
    "lon": 97.63108,
    "alt_m": 13232.1
   },
   "member_spread_deg": {
    "lat": 25.14,
    "lon": 87.37
   }
  },
  {
   "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": 121.83,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-28 23:30:00",
    "lat": -18.10163,
    "lon": 11.68784,
    "alt_m": 14547.2
   },
   "member_spread_deg": {
    "lat": 29.83,
    "lon": 106.61
   }
  },
  {
   "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": 12.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 12:15:00",
    "lat": 12.1583,
    "lon": 129.12145,
    "alt_m": 12198.0
   },
   "member_spread_deg": {
    "lat": 48.57,
    "lon": 332.58
   }
  },
  {
   "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": 12.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 12:45:00",
    "lat": 75.24992,
    "lon": -161.40254,
    "alt_m": 13233.7
   },
   "member_spread_deg": {
    "lat": 24.88,
    "lon": 338.23
   }
  },
  {
   "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": 107.71,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-29 13:30:00",
    "lat": 30.38761,
    "lon": 65.31259,
    "alt_m": 14861.5
   },
   "member_spread_deg": {
    "lat": 32.76,
    "lon": 41.66
   }
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 18:58:00",
   "seed_lat": 47.08333,
   "seed_lon": -33.20833,
   "seed_alt_m": 15770.0,
   "seed_age_h": 6.75,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-02 18:30:00",
    "lat": 70.71463,
    "lon": 84.98863,
    "alt_m": 15495.1
   },
   "member_spread_deg": {
    "lat": 27.59,
    "lon": 88.53
   }
  },
  {
   "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,
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   "member_spread_deg": {
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    "lon": 349.55
   }
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-25 08:27:00",
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   "seed_lon": 125.16667,
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   "nominal_end": {
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    "lon": 60.14
   }
  },
  {
   "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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   "dead_reckoned": true,
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   "nominal_end": {
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    "lat": 40.30236,
    "lon": -167.98938,
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    "lon": 342.83
   }
  },
  {
   "callsign": "YU9OMT-1",
   "flight_id": "YU9OMT-1_2026-05-24",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 12:50:00",
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   "seed_lon": 35.08336,
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   "seed_age_h": 12.89,
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   "nominal_end": {
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    "lon": 340.71
   }
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 15:49:00",
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   "seed_lon": -1.45833,
   "seed_alt_m": 12320.0,
   "seed_age_h": 9.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-02 15:15:00",
    "lat": -29.81341,
    "lon": -86.1568,
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   "member_spread_deg": {
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    "lon": 320.44
   }
  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-26 16:15:00",
   "seed_lat": -1.45833,
   "seed_lon": -0.875,
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   "seed_age_h": 9.47,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-02 15:45:00",
    "lat": -24.03839,
    "lon": -179.62421,
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   "member_spread_deg": {
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    "lon": 331.0
   }
  },
  {
   "callsign": "ZS6ZU-11",
   "flight_id": "ZS6ZU-11_2026-07-17",
   "payload_type": "WSPR",
   "seed_time": "2026-07-20 01:53:00",
   "seed_lat": -22.0625,
   "seed_lon": -151.29167,
   "seed_alt_m": 13360.0,
   "seed_age_h": 167.84,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-07-27 01:30:00",
    "lat": -25.53905,
    "lon": 47.43758,
    "alt_m": 13157.4
   },
   "member_spread_deg": {
    "lat": 27.78,
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   }
  }
 ]
}