{
 "generated_utc": "2026-08-05T11:27:41Z",
 "gfs_cycle_utc": "2026-08-05T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 495.5,
  "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_20260805_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260805_06Z.geojson.gz"
 },
 "counts": {
  "flights": 37,
  "members": 9,
  "rows": 186939
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 10:48:40",
   "seed_lat": -44.5625,
   "seed_lon": -26.91665,
   "seed_alt_m": 12810.0,
   "seed_age_h": 0.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 10:15:00",
    "lat": -35.91914,
    "lon": -133.42976,
    "alt_m": 12930.1
   },
   "member_spread_deg": {
    "lat": 6.03,
    "lon": 44.98
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.16
   },
   "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": 281.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 59.87144,
    "lon": -117.84554,
    "alt_m": 13010.5
   },
   "member_spread_deg": {
    "lat": 23.86,
    "lon": 201.58
   },
   "member_spread_now_deg": {
    "lat": 49.26,
    "lon": 342.82
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 09:04:18",
   "seed_lat": 73.54167,
   "seed_lon": -125.83333,
   "seed_alt_m": 12740.0,
   "seed_age_h": 2.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 08:30:00",
    "lat": 56.44858,
    "lon": 56.3922,
    "alt_m": 12856.3
   },
   "member_spread_deg": {
    "lat": 47.32,
    "lon": 203.91
   },
   "member_spread_now_deg": {
    "lat": 1.39,
    "lon": 0.84
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 10:55:19",
   "seed_lat": 48.9375,
   "seed_lon": 2.125,
   "seed_alt_m": 14080.0,
   "seed_age_h": 0.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-12 11:00:00",
    "lat": 60.07245,
    "lon": 151.24865,
    "alt_m": 14112.9
   },
   "member_spread_deg": {
    "lat": 24.62,
    "lon": 326.31
   },
   "member_spread_now_deg": {
    "lat": 0.05,
    "lon": 0.26
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:54:00",
   "seed_lat": 27.625,
   "seed_lon": -158.79167,
   "seed_alt_m": 12970.0,
   "seed_age_h": 8.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 48.3374,
    "lon": -128.7169,
    "alt_m": 12995.8
   },
   "member_spread_deg": {
    "lat": 29.75,
    "lon": 102.43
   },
   "member_spread_now_deg": {
    "lat": 2.61,
    "lon": 6.17
   },
   "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": 267.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 70.53857,
    "lon": 72.30943,
    "alt_m": 12474.3
   },
   "member_spread_deg": {
    "lat": 32.55,
    "lon": 352.77
   },
   "member_spread_now_deg": {
    "lat": 41.82,
    "lon": 202.93
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 01:23:00",
   "seed_lat": 37.0,
   "seed_lon": -138.5,
   "seed_alt_m": 13640.0,
   "seed_age_h": 9.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 27.02161,
    "lon": -119.62457,
    "alt_m": 13869.2
   },
   "member_spread_deg": {
    "lat": 35.03,
    "lon": 135.06
   },
   "member_spread_now_deg": {
    "lat": 3.2,
    "lon": 2.81
   },
   "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": 30.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 39.38313,
    "lon": -89.87015,
    "alt_m": 13637.5
   },
   "member_spread_deg": {
    "lat": 74.6,
    "lon": 358.69
   },
   "member_spread_now_deg": {
    "lat": 10.21,
    "lon": 10.3
   },
   "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": 188.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 32.06854,
    "lon": 60.25085,
    "alt_m": 9149.5
   },
   "member_spread_deg": {
    "lat": 43.42,
    "lon": 331.42
   },
   "member_spread_now_deg": {
    "lat": 39.37,
    "lon": 127.24
   },
   "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": 259.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 26.31626,
    "lon": -41.95714,
    "alt_m": 8741.5
   },
   "member_spread_deg": {
    "lat": 43.95,
    "lon": 323.07
   },
   "member_spread_now_deg": {
    "lat": 34.07,
    "lon": 312.07
   },
   "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": 171.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 55.64701,
    "lon": 29.00135,
    "alt_m": 12389.6
   },
   "member_spread_deg": {
    "lat": 55.18,
    "lon": 305.8
   },
   "member_spread_now_deg": {
    "lat": 37.16,
    "lon": 72.27
   },
   "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": 171.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 34.69967,
    "lon": -59.18234,
    "alt_m": 12730.5
   },
   "member_spread_deg": {
    "lat": 41.45,
    "lon": 146.11
   },
   "member_spread_now_deg": {
    "lat": 37.73,
    "lon": 53.65
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 07:33:00",
   "seed_lat": 69.58333,
   "seed_lon": 157.33333,
   "seed_alt_m": 12040.0,
   "seed_age_h": 3.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 07:00:00",
    "lat": 68.88202,
    "lon": 98.38437,
    "alt_m": 11981.2
   },
   "member_spread_deg": {
    "lat": 24.61,
    "lon": 256.99
   },
   "member_spread_now_deg": {
    "lat": 2.98,
    "lon": 7.01
   },
   "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": 287.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 74.38699,
    "lon": -127.37467,
    "alt_m": 14973.4
   },
   "member_spread_deg": {
    "lat": 23.94,
    "lon": 344.68
   },
   "member_spread_now_deg": {
    "lat": 17.79,
    "lon": 313.97
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:23:00",
   "seed_lat": 73.125,
   "seed_lon": -140.66667,
   "seed_alt_m": 12950.0,
   "seed_age_h": 8.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 63.24961,
    "lon": 8.09266,
    "alt_m": 12766.5
   },
   "member_spread_deg": {
    "lat": 48.96,
    "lon": 185.87
   },
   "member_spread_now_deg": {
    "lat": 7.8,
    "lon": 10.34
   },
   "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": 311.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 59.51735,
    "lon": -77.96751,
    "alt_m": 13356.5
   },
   "member_spread_deg": {
    "lat": 78.86,
    "lon": 284.51
   },
   "member_spread_now_deg": {
    "lat": 44.92,
    "lon": 344.1
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 10:35:37",
   "seed_lat": 44.91661,
   "seed_lon": 79.375,
   "seed_alt_m": 12870.0,
   "seed_age_h": 0.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 10:00:00",
    "lat": 40.08775,
    "lon": -148.79413,
    "alt_m": 13214.0
   },
   "member_spread_deg": {
    "lat": 74.42,
    "lon": 354.92
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.22
   },
   "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": 220.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 12.78273,
    "lon": -174.98693,
    "alt_m": 13273.4
   },
   "member_spread_deg": {
    "lat": 66.16,
    "lon": 327.06
   },
   "member_spread_now_deg": {
    "lat": 66.42,
    "lon": 306.39
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:47:18",
   "seed_lat": 50.85417,
   "seed_lon": -105.79167,
   "seed_alt_m": 13290.0,
   "seed_age_h": 8.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 61.98996,
    "lon": 61.253,
    "alt_m": 13410.5
   },
   "member_spread_deg": {
    "lat": 13.9,
    "lon": 154.45
   },
   "member_spread_now_deg": {
    "lat": 1.81,
    "lon": 3.0
   },
   "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": 194.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 44.13797,
    "lon": -138.36922,
    "alt_m": 13463.9
   },
   "member_spread_deg": {
    "lat": 37.62,
    "lon": 192.6
   },
   "member_spread_now_deg": {
    "lat": 29.94,
    "lon": 261.92
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-02 11:30:43",
   "seed_lat": 67.33328,
   "seed_lon": 65.58336,
   "seed_alt_m": 12840.0,
   "seed_age_h": 71.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:30:00",
    "lat": 59.1143,
    "lon": 85.2419,
    "alt_m": 12586.1
   },
   "member_spread_deg": {
    "lat": 32.9,
    "lon": 264.76
   },
   "member_spread_now_deg": {
    "lat": 29.82,
    "lon": 340.27
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 02:20:00",
   "seed_lat": 51.08333,
   "seed_lon": -132.83333,
   "seed_alt_m": 12670.0,
   "seed_age_h": 9.0,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 46.59188,
    "lon": 15.17901,
    "alt_m": 12832.9
   },
   "member_spread_deg": {
    "lat": 22.24,
    "lon": 93.66
   },
   "member_spread_now_deg": {
    "lat": 0.5,
    "lon": 2.07
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 22:11:00",
   "seed_lat": 52.41667,
   "seed_lon": -94.29167,
   "seed_alt_m": 12100.0,
   "seed_age_h": 13.15,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 05:45:00",
    "lat": 51.27796,
    "lon": -84.39484,
    "alt_m": 12049.0
   },
   "member_spread_deg": {
    "lat": 16.2,
    "lon": 31.79
   },
   "member_spread_now_deg": {
    "lat": 0.9,
    "lon": 6.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
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  },
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   "seed_time": "2026-08-01 22:55:27",
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  },
  {
   "callsign": "KI6DS-11",
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   "seed_time": "2026-08-05 10:55:45",
   "seed_lat": 88.49995,
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  },
  {
   "callsign": "PC4L-11",
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   "seed_time": "2026-07-26 12:46:26",
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   "display_reason": "member_spread"
  },
  {
   "callsign": "SP0LND-6",
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   "seed_time": "2026-07-26 13:19:17",
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   "nominal_end": {
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-1",
   "flight_id": "SP2ROC-1_2026-03-14",
   "payload_type": "APRS",
   "seed_time": "2026-07-22 14:00:27",
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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": "2026-08-05 10:01:00",
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   "seed_lon": 107.79167,
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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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   "seed_lon": -160.0,
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   "display_as": "region",
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  },
  {
   "callsign": "SP6MPL-9",
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   "seed_time": "2026-08-04 04:05:45",
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  },
  {
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   "seed_time": "2026-08-05 10:21:00",
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  },
  {
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   "payload_type": "WSPR",
   "seed_time": "2026-08-05 10:55:23",
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  },
  {
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   "seed_time": "2026-07-26 12:50:00",
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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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  },
  {
   "callsign": "ZS6SRC-84",
   "flight_id": "ZS6SRC-84_2026-07-12",
   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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   "nominal_end": {
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   "display_as": "region",
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  }
 ]
}