{
 "generated_utc": "2026-08-06T23:27:30Z",
 "gfs_cycle_utc": "2026-08-06T18:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 485.5,
  "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_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260806_18Z.geojson.gz"
 },
 "counts": {
  "flights": 34,
  "members": 9,
  "rows": 177165
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 14:33:40",
   "seed_lat": -44.375,
   "seed_lon": 29.08335,
   "seed_alt_m": 12660.0,
   "seed_age_h": 8.77,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": -36.35607,
    "lon": -153.5611,
    "alt_m": 12896.0
   },
   "member_spread_deg": {
    "lat": 41.9,
    "lon": 178.18
   },
   "member_spread_now_deg": {
    "lat": 0.49,
    "lon": 2.56
   },
   "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": 317.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 56.58833,
    "lon": -124.16897,
    "alt_m": 13035.1
   },
   "member_spread_deg": {
    "lat": 48.81,
    "lon": 230.47
   },
   "member_spread_now_deg": {
    "lat": 51.01,
    "lon": 137.53
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 22:36:17",
   "seed_lat": 54.75,
   "seed_lon": -113.29167,
   "seed_alt_m": 12750.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 22:00:00",
    "lat": 60.94668,
    "lon": 64.17855,
    "alt_m": 12636.7
   },
   "member_spread_deg": {
    "lat": 17.56,
    "lon": 70.6
   },
   "member_spread_now_deg": {
    "lat": 0.18,
    "lon": 0.22
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 09:15:03",
   "seed_lat": 58.04167,
   "seed_lon": 26.125,
   "seed_alt_m": 13940.0,
   "seed_age_h": 14.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 48.01389,
    "lon": 169.08956,
    "alt_m": 14076.8
   },
   "member_spread_deg": {
    "lat": 34.24,
    "lon": 331.95
   },
   "member_spread_now_deg": {
    "lat": 3.71,
    "lon": 8.7
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 22:19:00",
   "seed_lat": 36.4375,
   "seed_lon": -151.45833,
   "seed_alt_m": 13040.0,
   "seed_age_h": 1.02,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 21:45:00",
    "lat": 56.08554,
    "lon": 1.94113,
    "alt_m": 12843.0
   },
   "member_spread_deg": {
    "lat": 52.99,
    "lon": 152.14
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.48
   },
   "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": 303.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 76.16144,
    "lon": 26.90744,
    "alt_m": 12310.3
   },
   "member_spread_deg": {
    "lat": 33.03,
    "lon": 345.04
   },
   "member_spread_now_deg": {
    "lat": 34.92,
    "lon": 218.85
   },
   "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 22:53:00",
   "seed_lat": 37.4375,
   "seed_lon": -100.95833,
   "seed_alt_m": 13850.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 23:00:00",
    "lat": 17.83789,
    "lon": -126.9468,
    "alt_m": 13999.4
   },
   "member_spread_deg": {
    "lat": 30.19,
    "lon": 53.22
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.1
   },
   "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": 66.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 33.28804,
    "lon": -127.37657,
    "alt_m": 13333.4
   },
   "member_spread_deg": {
    "lat": 81.29,
    "lon": 315.78
   },
   "member_spread_now_deg": {
    "lat": 23.15,
    "lon": 27.73
   },
   "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": 224.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 30.80815,
    "lon": 58.67351,
    "alt_m": 9136.2
   },
   "member_spread_deg": {
    "lat": 39.89,
    "lon": 309.16
   },
   "member_spread_now_deg": {
    "lat": 38.68,
    "lon": 143.3
   },
   "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": 295.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 47.90375,
    "lon": 4.65567,
    "alt_m": 8806.8
   },
   "member_spread_deg": {
    "lat": 33.75,
    "lon": 339.95
   },
   "member_spread_now_deg": {
    "lat": 40.46,
    "lon": 328.25
   },
   "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": 207.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 66.09418,
    "lon": 77.48202,
    "alt_m": 12246.0
   },
   "member_spread_deg": {
    "lat": 50.0,
    "lon": 313.58
   },
   "member_spread_now_deg": {
    "lat": 44.96,
    "lon": 118.17
   },
   "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": 207.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 23.60906,
    "lon": -91.89782,
    "alt_m": 12753.5
   },
   "member_spread_deg": {
    "lat": 46.78,
    "lon": 105.36
   },
   "member_spread_now_deg": {
    "lat": 37.48,
    "lon": 59.54
   },
   "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 17:53:00",
   "seed_lat": 83.8125,
   "seed_lon": -34.54167,
   "seed_alt_m": 12120.0,
   "seed_age_h": 5.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 63.46344,
    "lon": 10.95413,
    "alt_m": 12206.1
   },
   "member_spread_deg": {
    "lat": 27.13,
    "lon": 232.14
   },
   "member_spread_now_deg": {
    "lat": 2.85,
    "lon": 1.47
   },
   "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": 323.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 58.31539,
    "lon": -98.03922,
    "alt_m": 15116.4
   },
   "member_spread_deg": {
    "lat": 24.79,
    "lon": 219.75
   },
   "member_spread_now_deg": {
    "lat": 27.48,
    "lon": 347.18
   },
   "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 22:08:00",
   "seed_lat": 62.5,
   "seed_lon": -130.66667,
   "seed_alt_m": 12960.0,
   "seed_age_h": 1.2,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 21:45:00",
    "lat": 57.7801,
    "lon": -39.14657,
    "alt_m": 12634.4
   },
   "member_spread_deg": {
    "lat": 16.49,
    "lon": 82.07
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.28
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 07:15:37",
   "seed_lat": 53.91661,
   "seed_lon": 105.08333,
   "seed_alt_m": 13060.0,
   "seed_age_h": 16.07,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 23.38746,
    "lon": -160.42719,
    "alt_m": 13446.6
   },
   "member_spread_deg": {
    "lat": 68.95,
    "lon": 339.62
   },
   "member_spread_now_deg": {
    "lat": 1.81,
    "lon": 6.86
   },
   "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": 256.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 11.08644,
    "lon": -177.33698,
    "alt_m": 13243.6
   },
   "member_spread_deg": {
    "lat": 53.01,
    "lon": 355.51
   },
   "member_spread_now_deg": {
    "lat": 71.23,
    "lon": 286.39
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 22:57:04",
   "seed_lat": 57.83333,
   "seed_lon": -72.54167,
   "seed_alt_m": 13310.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 23:00:00",
    "lat": 65.26956,
    "lon": 5.61108,
    "alt_m": 13200.8
   },
   "member_spread_deg": {
    "lat": 16.17,
    "lon": 52.0
   },
   "member_spread_now_deg": {
    "lat": 0.04,
    "lon": 0.29
   },
   "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": 230.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 58.4301,
    "lon": -153.88559,
    "alt_m": 12882.3
   },
   "member_spread_deg": {
    "lat": 40.41,
    "lon": 255.48
   },
   "member_spread_now_deg": {
    "lat": 24.06,
    "lon": 273.96
   },
   "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": 21.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 64.93659,
    "lon": 61.46579,
    "alt_m": 12587.9
   },
   "member_spread_deg": {
    "lat": 26.86,
    "lon": 334.58
   },
   "member_spread_now_deg": {
    "lat": 17.66,
    "lon": 143.52
   },
   "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 22:10:00",
   "seed_lat": 50.70833,
   "seed_lon": -73.83333,
   "seed_alt_m": 12630.0,
   "seed_age_h": 1.17,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 21:45:00",
    "lat": 61.99739,
    "lon": 90.05791,
    "alt_m": 12282.5
   },
   "member_spread_deg": {
    "lat": 26.52,
    "lon": 86.81
   },
   "member_spread_now_deg": {
    "lat": 0.38,
    "lon": 1.09
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 20:26:00",
   "seed_lat": 62.16667,
   "seed_lon": -80.625,
   "seed_alt_m": 12140.0,
   "seed_age_h": 2.9,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 20:00:00",
    "lat": 49.20163,
    "lon": -78.46137,
    "alt_m": 12074.5
   },
   "member_spread_deg": {
    "lat": 7.71,
    "lon": 34.19
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "lon": 0.96
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 15:31:00",
   "seed_lat": 38.9375,
   "seed_lon": 14.83333,
   "seed_alt_m": 12250.0,
   "seed_age_h": 7.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:30:00",
    "lat": 43.21111,
    "lon": -159.83179,
    "alt_m": 12419.7
   },
   "member_spread_deg": {
    "lat": 28.59,
    "lon": 318.14
   },
   "member_spread_now_deg": {
    "lat": 3.5,
    "lon": 0.87
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KI1TEN-1",
   "flight_id": "KI1TEN-1_2026-07-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-01 22:55:27",
   "seed_lat": 23.95828,
   "seed_lon": -104.12496,
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    "lat": -1.22529,
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   },
   "member_spread_deg": {
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   "member_spread_now_deg": {
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   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 19:55:45",
   "seed_lat": 74.12495,
   "seed_lon": -25.58331,
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   "nominal_end": {
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    "lat": 76.38704,
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   },
   "member_spread_deg": {
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   },
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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,
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   "seed_age_h": 274.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-13 17:45:00",
    "lat": 21.21333,
    "lon": -142.29816,
    "alt_m": 12141.4
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 53.4,
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   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 274.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 65.27345,
    "lon": -40.21342,
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   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
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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 22:51:00",
   "seed_lat": 55.58333,
   "seed_lon": 137.95833,
   "seed_alt_m": 15460.0,
   "seed_age_h": 0.48,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-13 22:15:00",
    "lat": 87.84912,
    "lon": -61.81634,
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   },
   "member_spread_deg": {
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   "member_spread_now_deg": {
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   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP6MPL-34",
   "flight_id": "SP6MPL-34_2025-12-03",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 18:52:00",
   "seed_lat": 74.5625,
   "seed_lon": -160.0,
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   "seed_age_h": 148.47,
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   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 59.36876,
    "lon": -166.30721,
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   "member_spread_deg": {
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP6MPL-9",
   "flight_id": "SP6MPL-9_2026-08-02",
   "payload_type": "APRS",
   "seed_time": "2026-08-04 04:05:45",
   "seed_lat": 45.52942,
   "seed_lon": 75.286,
   "seed_alt_m": 12836.0,
   "seed_age_h": 67.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 39.95876,
    "lon": -18.36459,
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   "member_spread_deg": {
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   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-06 10:31:00",
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   "seed_lon": 27.75,
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   "seed_age_h": 12.82,
   "float_reliable": true,
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   "nominal_end": {
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    "lon": 150.60677,
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   "member_spread_deg": {
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   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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,
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   "seed_age_h": 274.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 65.2151,
    "lon": -27.33706,
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   "member_spread_deg": {
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-37",
   "flight_id": "ZS6SRC-37_2026-07-15",
   "payload_type": "WSPR",
   "seed_time": "2026-07-31 04:34:00",
   "seed_lat": -23.70833,
   "seed_lon": 149.29167,
   "seed_alt_m": 12380.0,
   "seed_age_h": 162.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
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    "lat": -26.04981,
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   "member_spread_deg": {
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   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 248.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 2.71898,
    "lon": -51.70471,
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   "member_spread_deg": {
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   "member_spread_now_deg": {
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    "lon": 255.07
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   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}