{
 "generated_utc": "2026-08-04T17:27:45Z",
 "gfs_cycle_utc": "2026-08-04T12:00:00Z",
 "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_20260804_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260804_12Z.geojson.gz"
 },
 "counts": {
  "flights": 37,
  "members": 9,
  "rows": 186372
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 16:53:40",
   "seed_lat": -44.35417,
   "seed_lon": -59.58332,
   "seed_alt_m": 12570.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 17:00:00",
    "lat": -36.97063,
    "lon": -158.47607,
    "alt_m": 12894.9
   },
   "member_spread_deg": {
    "lat": 14.77,
    "lon": 338.33
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.22
   },
   "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": 263.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 62.99698,
    "lon": -111.11299,
    "alt_m": 13076.8
   },
   "member_spread_deg": {
    "lat": 34.98,
    "lon": 173.92
   },
   "member_spread_now_deg": {
    "lat": 39.6,
    "lon": 340.86
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 16:43:48",
   "seed_lat": 78.875,
   "seed_lon": -132.20833,
   "seed_alt_m": 12580.0,
   "seed_age_h": 0.6,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 16:15:00",
    "lat": 62.7129,
    "lon": -28.62922,
    "alt_m": 12494.2
   },
   "member_spread_deg": {
    "lat": 40.03,
    "lon": 98.59
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.3
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 15:32:48",
   "seed_lat": 39.85417,
   "seed_lon": -19.125,
   "seed_alt_m": 14230.0,
   "seed_age_h": 1.79,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 15:00:00",
    "lat": 56.06878,
    "lon": 129.35859,
    "alt_m": 14111.3
   },
   "member_spread_deg": {
    "lat": 27.69,
    "lon": 43.31
   },
   "member_spread_now_deg": {
    "lat": 0.54,
    "lon": 0.89
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:01:30",
   "seed_lat": 28.33333,
   "seed_lon": -171.70833,
   "seed_alt_m": 13070.0,
   "seed_age_h": 13.31,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 50.57926,
    "lon": -57.92902,
    "alt_m": 12612.5
   },
   "member_spread_deg": {
    "lat": 27.47,
    "lon": 89.45
   },
   "member_spread_now_deg": {
    "lat": 0.71,
    "lon": 4.0
   },
   "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": 249.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 73.35846,
    "lon": 23.41447,
    "alt_m": 12505.4
   },
   "member_spread_deg": {
    "lat": 36.24,
    "lon": 285.99
   },
   "member_spread_now_deg": {
    "lat": 46.93,
    "lon": 207.45
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 01:23:00",
   "seed_lat": 24.875,
   "seed_lon": -146.33333,
   "seed_alt_m": 13840.0,
   "seed_age_h": 15.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 12.88375,
    "lon": -122.69128,
    "alt_m": 13961.6
   },
   "member_spread_deg": {
    "lat": 41.31,
    "lon": 86.95
   },
   "member_spread_now_deg": {
    "lat": 3.25,
    "lon": 4.84
   },
   "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": 12.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 18.7807,
    "lon": -136.79654,
    "alt_m": 13685.8
   },
   "member_spread_deg": {
    "lat": 32.34,
    "lon": 71.91
   },
   "member_spread_now_deg": {
    "lat": 3.21,
    "lon": 356.34
   },
   "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": 170.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 31.35703,
    "lon": 64.71359,
    "alt_m": 9089.1
   },
   "member_spread_deg": {
    "lat": 71.31,
    "lon": 345.15
   },
   "member_spread_now_deg": {
    "lat": 38.78,
    "lon": 134.12
   },
   "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": 241.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 36.70794,
    "lon": -28.84022,
    "alt_m": 8674.0
   },
   "member_spread_deg": {
    "lat": 35.76,
    "lon": 323.28
   },
   "member_spread_now_deg": {
    "lat": 26.17,
    "lon": 307.59
   },
   "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": 153.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 23.7921,
    "lon": -90.94059,
    "alt_m": 12751.0
   },
   "member_spread_deg": {
    "lat": 38.02,
    "lon": 299.53
   },
   "member_spread_now_deg": {
    "lat": 39.65,
    "lon": 351.38
   },
   "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": 153.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 48.43286,
    "lon": 37.48126,
    "alt_m": 12317.5
   },
   "member_spread_deg": {
    "lat": 29.1,
    "lon": 184.07
   },
   "member_spread_now_deg": {
    "lat": 40.54,
    "lon": 350.31
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 09:18:00",
   "seed_lat": 59.58333,
   "seed_lon": 131.5,
   "seed_alt_m": 12210.0,
   "seed_age_h": 8.03,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 60.17786,
    "lon": -55.5635,
    "alt_m": 12241.2
   },
   "member_spread_deg": {
    "lat": 17.93,
    "lon": 110.6
   },
   "member_spread_now_deg": {
    "lat": 3.82,
    "lon": 1.82
   },
   "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": 269.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 69.99285,
    "lon": -59.51456,
    "alt_m": 14906.3
   },
   "member_spread_deg": {
    "lat": 23.42,
    "lon": 347.96
   },
   "member_spread_now_deg": {
    "lat": 19.87,
    "lon": 297.31
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 04:03:00",
   "seed_lat": 64.5625,
   "seed_lon": -157.70833,
   "seed_alt_m": 12700.0,
   "seed_age_h": 13.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 31.61456,
    "lon": -81.22228,
    "alt_m": 13533.1
   },
   "member_spread_deg": {
    "lat": 40.47,
    "lon": 313.42
   },
   "member_spread_now_deg": {
    "lat": 4.63,
    "lon": 28.05
   },
   "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": 293.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 50.16791,
    "lon": -30.10207,
    "alt_m": 13763.6
   },
   "member_spread_deg": {
    "lat": 94.82,
    "lon": 273.69
   },
   "member_spread_now_deg": {
    "lat": 36.52,
    "lon": 349.84
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-03 14:10:37",
   "seed_lat": 43.77078,
   "seed_lon": 25.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 27.16,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 31.50496,
    "lon": -167.23568,
    "alt_m": 13468.3
   },
   "member_spread_deg": {
    "lat": 65.81,
    "lon": 295.07
   },
   "member_spread_now_deg": {
    "lat": 4.68,
    "lon": 11.99
   },
   "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": 202.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 30.11328,
    "lon": -151.88317,
    "alt_m": 13179.1
   },
   "member_spread_deg": {
    "lat": 54.79,
    "lon": 310.13
   },
   "member_spread_now_deg": {
    "lat": 68.22,
    "lon": 331.23
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 16:57:03",
   "seed_lat": 53.41667,
   "seed_lon": -110.25,
   "seed_alt_m": 13310.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 17:00:00",
    "lat": 53.68541,
    "lon": 57.19208,
    "alt_m": 13454.1
   },
   "member_spread_deg": {
    "lat": 26.23,
    "lon": 124.84
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 0.1
   },
   "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": 176.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:45:00",
    "lat": 43.69934,
    "lon": -160.84035,
    "alt_m": 13092.1
   },
   "member_spread_deg": {
    "lat": 37.32,
    "lon": 338.1
   },
   "member_spread_now_deg": {
    "lat": 24.31,
    "lon": 246.82
   },
   "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": 53.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 11:30:00",
    "lat": 59.2292,
    "lon": -52.06289,
    "alt_m": 12443.8
   },
   "member_spread_deg": {
    "lat": 34.41,
    "lon": 346.67
   },
   "member_spread_now_deg": {
    "lat": 12.91,
    "lon": 30.39
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 16:10:00",
   "seed_lat": 44.54167,
   "seed_lon": -142.125,
   "seed_alt_m": 12540.0,
   "seed_age_h": 1.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-11 15:45:00",
    "lat": 52.65562,
    "lon": 61.55582,
    "alt_m": 12243.4
   },
   "member_spread_deg": {
    "lat": 24.79,
    "lon": 121.42
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 0.37
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 16:31:00",
   "seed_lat": 51.60417,
   "seed_lon": -98.54167,
   "seed_alt_m": 12140.0,
   "seed_age_h": 0.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-11 16:00:00",
    "lat": 52.35691,
    "lon": -93.23313,
    "alt_m": 12010.6
   },
   "member_spread_deg": {
    "lat": 8.11,
    "lon": 24.19
   },
   "member_spread_now_deg": {
    "lat": 0.15,
    "lon": 0.24
   },
   "display_as": "track",
   "display_reason": "fresh"
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   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 16:01:00",
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  },
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   "flight_id": "KI1TEN-1_2026-07-23",
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   "seed_time": "2026-08-01 22:55:27",
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   "nominal_end": {
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  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-04 05:55:45",
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   "seed_lon": 148.04169,
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   "nominal_end": {
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  },
  {
   "callsign": "N0MPM-31",
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   "payload_type": "WSPR",
   "seed_time": "2026-07-21 23:53:19",
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   "display_as": "region",
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  },
  {
   "callsign": "PC4L-11",
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   "payload_type": "APRS",
   "seed_time": "2026-07-26 12:46:26",
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   "nominal_end": {
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   "display_as": "region",
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  },
  {
   "callsign": "SP0LND-6",
   "flight_id": "SP0LND-6_2026-07-25",
   "payload_type": "APRS",
   "seed_time": "2026-07-26 13:19:17",
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   "seed_lon": 29.04891,
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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": "2026-08-04 09:51:00",
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   "seed_lon": 91.41667,
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  },
  {
   "callsign": "SP6MPL-34",
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   "display_as": "region",
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  },
  {
   "callsign": "SP6MPL-9",
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  },
  {
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   "seed_time": "2026-08-04 15:36:00",
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  },
  {
   "callsign": "YU9OMT-1",
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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",
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   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
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  },
  {
   "callsign": "ZS6SRC-84",
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   "payload_type": "WSPR",
   "seed_time": "2026-07-27 15:20:00",
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  }
 ]
}