{
 "generated_utc": "2026-08-06T05:28:03Z",
 "gfs_cycle_utc": "2026-08-06T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 491.5,
  "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_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260806_00Z.geojson.gz"
 },
 "counts": {
  "flights": 36,
  "members": 9,
  "rows": 183096
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:48:40",
   "seed_lat": -42.02084,
   "seed_lon": -12.83332,
   "seed_alt_m": 12780.0,
   "seed_age_h": 12.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": -41.85628,
    "lon": -160.81359,
    "alt_m": 12908.3
   },
   "member_spread_deg": {
    "lat": 11.45,
    "lon": 69.83
   },
   "member_spread_now_deg": {
    "lat": 3.48,
    "lon": 1.3
   },
   "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": 299.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 58.77942,
    "lon": -113.9841,
    "alt_m": 13000.4
   },
   "member_spread_deg": {
    "lat": 40.6,
    "lon": 261.52
   },
   "member_spread_now_deg": {
    "lat": 55.84,
    "lon": 341.73
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 02:18:49",
   "seed_lat": 65.10417,
   "seed_lon": -125.75,
   "seed_alt_m": 12940.0,
   "seed_age_h": 3.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 01:45:00",
    "lat": 61.27629,
    "lon": 16.5899,
    "alt_m": 12848.3
   },
   "member_spread_deg": {
    "lat": 28.46,
    "lon": 199.58
   },
   "member_spread_now_deg": {
    "lat": 2.41,
    "lon": 0.81
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 17:48:48",
   "seed_lat": 52.4375,
   "seed_lon": 9.41667,
   "seed_alt_m": 14020.0,
   "seed_age_h": 11.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 47.36576,
    "lon": 160.57694,
    "alt_m": 14126.8
   },
   "member_spread_deg": {
    "lat": 29.0,
    "lon": 66.08
   },
   "member_spread_now_deg": {
    "lat": 2.64,
    "lon": 9.63
   },
   "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": 2.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 02:15:00",
    "lat": 36.48925,
    "lon": -39.29162,
    "alt_m": 13164.8
   },
   "member_spread_deg": {
    "lat": 46.68,
    "lon": 113.86
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 0.92
   },
   "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": 285.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 74.92173,
    "lon": 14.57112,
    "alt_m": 12388.5
   },
   "member_spread_deg": {
    "lat": 39.05,
    "lon": 242.22
   },
   "member_spread_now_deg": {
    "lat": 37.84,
    "lon": 205.37
   },
   "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 00:03:00",
   "seed_lat": 47.41667,
   "seed_lon": -119.875,
   "seed_alt_m": 13670.0,
   "seed_age_h": 5.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 26.64698,
    "lon": -120.754,
    "alt_m": 13934.4
   },
   "member_spread_deg": {
    "lat": 29.0,
    "lon": 63.08
   },
   "member_spread_now_deg": {
    "lat": 1.47,
    "lon": 2.98
   },
   "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": 48.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 43.97745,
    "lon": -106.22951,
    "alt_m": 13463.9
   },
   "member_spread_deg": {
    "lat": 75.64,
    "lon": 286.17
   },
   "member_spread_now_deg": {
    "lat": 16.45,
    "lon": 15.89
   },
   "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": 206.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 39.95049,
    "lon": 79.7774,
    "alt_m": 9083.4
   },
   "member_spread_deg": {
    "lat": 40.82,
    "lon": 316.83
   },
   "member_spread_now_deg": {
    "lat": 48.69,
    "lon": 135.95
   },
   "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": 277.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 58.15563,
    "lon": 18.28985,
    "alt_m": 8697.0
   },
   "member_spread_deg": {
    "lat": 32.96,
    "lon": 318.22
   },
   "member_spread_now_deg": {
    "lat": 49.84,
    "lon": 326.95
   },
   "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": 189.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 65.07003,
    "lon": -3.09457,
    "alt_m": 12047.0
   },
   "member_spread_deg": {
    "lat": 39.64,
    "lon": 339.5
   },
   "member_spread_now_deg": {
    "lat": 32.69,
    "lon": 87.59
   },
   "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": 189.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 26.96271,
    "lon": -45.34788,
    "alt_m": 12720.2
   },
   "member_spread_deg": {
    "lat": 34.06,
    "lon": 177.98
   },
   "member_spread_now_deg": {
    "lat": 40.94,
    "lon": 48.77
   },
   "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 03:43:00",
   "seed_lat": 84.375,
   "seed_lon": -169.125,
   "seed_alt_m": 12020.0,
   "seed_age_h": 1.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 03:15:00",
    "lat": 67.14741,
    "lon": 110.40691,
    "alt_m": 12246.0
   },
   "member_spread_deg": {
    "lat": 23.55,
    "lon": 211.87
   },
   "member_spread_now_deg": {
    "lat": 1.24,
    "lon": 6.76
   },
   "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": 305.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 71.27749,
    "lon": -119.41204,
    "alt_m": 14968.8
   },
   "member_spread_deg": {
    "lat": 26.56,
    "lon": 345.61
   },
   "member_spread_now_deg": {
    "lat": 20.22,
    "lon": 332.82
   },
   "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 02:08:00",
   "seed_lat": 65.45833,
   "seed_lon": -130.45833,
   "seed_alt_m": 13220.0,
   "seed_age_h": 3.2,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 01:45:00",
    "lat": 74.5258,
    "lon": -121.21795,
    "alt_m": 12679.6
   },
   "member_spread_deg": {
    "lat": 23.97,
    "lon": 193.89
   },
   "member_spread_now_deg": {
    "lat": 1.4,
    "lon": 0.75
   },
   "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": 329.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 49.34544,
    "lon": -32.67559,
    "alt_m": 13557.6
   },
   "member_spread_deg": {
    "lat": 81.55,
    "lon": 279.31
   },
   "member_spread_now_deg": {
    "lat": 60.73,
    "lon": 354.66
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 04:55:37",
   "seed_lat": 54.06244,
   "seed_lon": 101.875,
   "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 05:00:00",
    "lat": 37.24133,
    "lon": -144.48258,
    "alt_m": 13403.1
   },
   "member_spread_deg": {
    "lat": 64.61,
    "lon": 101.72
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "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": 238.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 32.34567,
    "lon": 167.81431,
    "alt_m": 13102.5
   },
   "member_spread_deg": {
    "lat": 63.92,
    "lon": 309.31
   },
   "member_spread_now_deg": {
    "lat": 66.86,
    "lon": 291.3
   },
   "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 01:33:49",
   "seed_lat": 49.95833,
   "seed_lon": -89.54167,
   "seed_alt_m": 13310.0,
   "seed_age_h": 3.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 01:00:00",
    "lat": 57.28881,
    "lon": -23.55371,
    "alt_m": 13211.4
   },
   "member_spread_deg": {
    "lat": 6.6,
    "lon": 112.32
   },
   "member_spread_now_deg": {
    "lat": 0.42,
    "lon": 1.23
   },
   "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": 212.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 23:45:00",
    "lat": 56.5634,
    "lon": -117.65972,
    "alt_m": 13039.8
   },
   "member_spread_deg": {
    "lat": 29.82,
    "lon": 318.93
   },
   "member_spread_now_deg": {
    "lat": 23.96,
    "lon": 296.05
   },
   "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": 3.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 01:30:00",
    "lat": 84.38259,
    "lon": 70.36699,
    "alt_m": 12417.2
   },
   "member_spread_deg": {
    "lat": 27.88,
    "lon": 156.87
   },
   "member_spread_now_deg": {
    "lat": 3.86,
    "lon": 359.51
   },
   "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 01:25:00",
   "seed_lat": 43.47917,
   "seed_lon": -105.08333,
   "seed_alt_m": 12790.0,
   "seed_age_h": 3.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 01:00:00",
    "lat": 55.08653,
    "lon": 77.45238,
    "alt_m": 12576.3
   },
   "member_spread_deg": {
    "lat": 30.28,
    "lon": 66.93
   },
   "member_spread_now_deg": {
    "lat": 0.47,
    "lon": 1.64
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 23:31:00",
   "seed_lat": 58.5625,
   "seed_lon": -82.5,
   "seed_alt_m": 12030.0,
   "seed_age_h": 5.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 23:30:00",
    "lat": 53.88459,
    "lon": -92.58379,
    "alt_m": 12057.3
   },
   "member_spread_deg": {
    "lat": 5.08,
    "lon": 31.22
   },
   "member_spread_now_deg": {
    "lat": 0.74,
    "lon": 1.71
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
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  },
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  },
  {
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   "payload_type": "WSPR",
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  },
  {
   "callsign": "PC4L-11",
   "flight_id": "PC4L-11_2026-07-16",
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   "seed_time": "2026-07-26 12:46:26",
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
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   "flight_id": "SP0LND-6_2026-07-25",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 13:19:17",
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   "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 04:51:00",
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   "nominal_end": {
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   "display_as": "track",
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  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
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   "display_as": "region",
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  },
  {
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  },
  {
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  },
  {
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   "seed_time": "2026-08-05 17:05:23",
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  },
  {
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   "display_as": "region",
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  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
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  },
  {
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   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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  }
 ]
}