{
 "generated_utc": "2026-08-09T05:27:21Z",
 "gfs_cycle_utc": "2026-08-09T00:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 491.0,
  "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_20260809_00Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260809_00Z.geojson.gz"
 },
 "counts": {
  "flights": 31,
  "members": 9,
  "rows": 160875
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 02:08:40",
   "seed_lat": -65.45834,
   "seed_lon": 152.41668,
   "seed_alt_m": 12570.0,
   "seed_age_h": 3.19,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 01:45:00",
    "lat": -47.62444,
    "lon": 57.05523,
    "alt_m": 12754.9
   },
   "member_spread_deg": {
    "lat": 17.44,
    "lon": 116.9
   },
   "member_spread_now_deg": {
    "lat": 0.29,
    "lon": 4.25
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 23:06:18",
   "seed_lat": 53.75,
   "seed_lon": -58.08333,
   "seed_alt_m": 12850.0,
   "seed_age_h": 6.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 59.09041,
    "lon": 79.66605,
    "alt_m": 12748.0
   },
   "member_spread_deg": {
    "lat": 15.3,
    "lon": 73.61
   },
   "member_spread_now_deg": {
    "lat": 1.33,
    "lon": 2.85
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 10:39:49",
   "seed_lat": 43.125,
   "seed_lon": 58.66667,
   "seed_alt_m": 14040.0,
   "seed_age_h": 18.67,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 31.46583,
    "lon": 164.82986,
    "alt_m": 14425.9
   },
   "member_spread_deg": {
    "lat": 20.11,
    "lon": 283.23
   },
   "member_spread_now_deg": {
    "lat": 2.8,
    "lon": 4.4
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 22:29:00",
   "seed_lat": 41.33333,
   "seed_lon": -89.70833,
   "seed_alt_m": 12920.0,
   "seed_age_h": 6.85,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 38.07217,
    "lon": 14.07137,
    "alt_m": 12715.8
   },
   "member_spread_deg": {
    "lat": 24.2,
    "lon": 122.59
   },
   "member_spread_now_deg": {
    "lat": 2.24,
    "lon": 3.95
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 22:13:00",
   "seed_lat": 23.95833,
   "seed_lon": -106.45833,
   "seed_alt_m": 13870.0,
   "seed_age_h": 7.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 13.63421,
    "lon": -96.31778,
    "alt_m": 13933.2
   },
   "member_spread_deg": {
    "lat": 20.69,
    "lon": 73.21
   },
   "member_spread_now_deg": {
    "lat": 2.67,
    "lon": 2.88
   },
   "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": 120.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 31.09786,
    "lon": -41.93415,
    "alt_m": 13548.3
   },
   "member_spread_deg": {
    "lat": 75.99,
    "lon": 280.08
   },
   "member_spread_now_deg": {
    "lat": 47.97,
    "lon": 328.56
   },
   "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": 278.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 20.99036,
    "lon": 92.62322,
    "alt_m": 9024.2
   },
   "member_spread_deg": {
    "lat": 43.7,
    "lon": 310.75
   },
   "member_spread_now_deg": {
    "lat": 21.47,
    "lon": 141.74
   },
   "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": 261.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 66.07503,
    "lon": 37.37005,
    "alt_m": 12055.3
   },
   "member_spread_deg": {
    "lat": 40.07,
    "lon": 240.37
   },
   "member_spread_now_deg": {
    "lat": 46.42,
    "lon": 189.45
   },
   "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": 261.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 19.59164,
    "lon": -81.56049,
    "alt_m": 12730.8
   },
   "member_spread_deg": {
    "lat": 51.29,
    "lon": 283.44
   },
   "member_spread_now_deg": {
    "lat": 41.61,
    "lon": 87.1
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 20:03:00",
   "seed_lat": 61.5,
   "seed_lon": -46.125,
   "seed_alt_m": 12360.0,
   "seed_age_h": 9.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 73.46389,
    "lon": 81.29939,
    "alt_m": 12335.1
   },
   "member_spread_deg": {
    "lat": 23.01,
    "lon": 73.77
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 1.89
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 01:03:00",
   "seed_lat": 68.625,
   "seed_lon": -121.29167,
   "seed_alt_m": 12810.0,
   "seed_age_h": 4.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 00:30:00",
    "lat": 62.46444,
    "lon": -95.35111,
    "alt_m": 12481.7
   },
   "member_spread_deg": {
    "lat": 11.97,
    "lon": 68.29
   },
   "member_spread_now_deg": {
    "lat": 0.39,
    "lon": 1.68
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "K5NOT-11",
   "flight_id": "K5NOT-11_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 02:00:37",
   "seed_lat": 43.35411,
   "seed_lon": 172.04167,
   "seed_alt_m": 13390.0,
   "seed_age_h": 3.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 01:30:00",
    "lat": 22.94822,
    "lon": -178.24921,
    "alt_m": 13496.2
   },
   "member_spread_deg": {
    "lat": 50.8,
    "lon": 326.84
   },
   "member_spread_now_deg": {
    "lat": 0.41,
    "lon": 0.74
   },
   "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": 310.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 35.14803,
    "lon": -118.85852,
    "alt_m": 13102.1
   },
   "member_spread_deg": {
    "lat": 62.15,
    "lon": 282.65
   },
   "member_spread_now_deg": {
    "lat": 69.43,
    "lon": 264.9
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 23:22:33",
   "seed_lat": 56.54167,
   "seed_lon": -51.58333,
   "seed_alt_m": 13380.0,
   "seed_age_h": 5.96,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 56.82931,
    "lon": 79.87175,
    "alt_m": 13477.1
   },
   "member_spread_deg": {
    "lat": 25.01,
    "lon": 65.44
   },
   "member_spread_now_deg": {
    "lat": 1.66,
    "lon": 1.87
   },
   "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": 284.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 60.47407,
    "lon": -40.81824,
    "alt_m": 12804.5
   },
   "member_spread_deg": {
    "lat": 44.59,
    "lon": 256.78
   },
   "member_spread_now_deg": {
    "lat": 26.19,
    "lon": 351.38
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 16:45:43",
   "seed_lat": 69.20828,
   "seed_lon": -32.66664,
   "seed_alt_m": 12600.0,
   "seed_age_h": 12.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 55.58307,
    "lon": 55.93185,
    "alt_m": 12254.9
   },
   "member_spread_deg": {
    "lat": 25.27,
    "lon": 140.68
   },
   "member_spread_now_deg": {
    "lat": 1.86,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 20:45:00",
   "seed_lat": 35.77083,
   "seed_lon": -40.20833,
   "seed_alt_m": 13070.0,
   "seed_age_h": 8.58,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 46.61783,
    "lon": 71.66175,
    "alt_m": 12757.1
   },
   "member_spread_deg": {
    "lat": 8.96,
    "lon": 66.81
   },
   "member_spread_now_deg": {
    "lat": 1.2,
    "lon": 2.76
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 22:21:00",
   "seed_lat": 62.70833,
   "seed_lon": -100.58333,
   "seed_alt_m": 12140.0,
   "seed_age_h": 6.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 74.0662,
    "lon": -12.80759,
    "alt_m": 12188.1
   },
   "member_spread_deg": {
    "lat": 34.09,
    "lon": 58.43
   },
   "member_spread_now_deg": {
    "lat": 1.51,
    "lon": 2.98
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-07 11:06:00",
   "seed_lat": 45.60417,
   "seed_lon": 28.54167,
   "seed_alt_m": 12090.0,
   "seed_age_h": 42.23,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 34.92224,
    "lon": 176.0933,
    "alt_m": 12494.0
   },
   "member_spread_deg": {
    "lat": 13.55,
    "lon": 311.72
   },
   "member_spread_now_deg": {
    "lat": 17.21,
    "lon": 41.14
   },
   "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,
   "seed_alt_m": 12380.0,
   "seed_age_h": 174.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 3.62442,
    "lon": -99.51987,
    "alt_m": 12358.6
   },
   "member_spread_deg": {
    "lat": 33.54,
    "lon": 89.35
   },
   "member_spread_now_deg": {
    "lat": 16.66,
    "lon": 14.82
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 20:25:45",
   "seed_lat": 60.58328,
   "seed_lon": -38.08331,
   "seed_alt_m": 13240.0,
   "seed_age_h": 8.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 74.16127,
    "lon": 135.70869,
    "alt_m": 13098.2
   },
   "member_spread_deg": {
    "lat": 19.51,
    "lon": 278.09
   },
   "member_spread_now_deg": {
    "lat": 1.05,
    "lon": 4.9
   },
   "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,
   "seed_alt_m": 11696.0,
   "seed_age_h": 328.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 52.2652,
    "lon": -36.58358,
    "alt_m": 12203.3
   },
   "member_spread_deg": {
    "lat": 85.63,
    "lon": 328.39
   },
   "member_spread_now_deg": {
    "lat": 55.64,
    "lon": 331.15
   },
   "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": 328.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 72.87513,
    "lon": -23.66706,
    "alt_m": 13354.7
   },
   "member_spread_deg": {
    "lat": 76.56,
    "lon": 250.42
   },
   "member_spread_now_deg": {
    "lat": 43.04,
    "lon": 164.16
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 06:48:00",
   "seed_lat": 63.0,
   "seed_lon": 153.125,
   "seed_alt_m": 15660.0,
   "seed_age_h": 22.53,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 45.31834,
    "lon": -164.32242,
    "alt_m": 16097.1
   },
   "member_spread_deg": {
    "lat": 70.14,
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   },
   "member_spread_now_deg": {
    "lat": 11.85,
    "lon": 355.76
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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,
   "seed_alt_m": 12890.0,
   "seed_age_h": 202.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 58.65443,
    "lon": -120.93126,
    "alt_m": 13262.0
   },
   "member_spread_deg": {
    "lat": 30.61,
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   },
   "member_spread_now_deg": {
    "lat": 25.23,
    "lon": 312.26
   },
   "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": 121.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 51.61498,
    "lon": 14.92369,
    "alt_m": 12993.9
   },
   "member_spread_deg": {
    "lat": 28.95,
    "lon": 240.07
   },
   "member_spread_now_deg": {
    "lat": 21.96,
    "lon": 357.18
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 03:01:00",
   "seed_lat": 46.29167,
   "seed_lon": 74.16667,
   "seed_alt_m": 13180.0,
   "seed_age_h": 2.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 03:00:00",
    "lat": 48.85873,
    "lon": -120.94818,
    "alt_m": 13144.1
   },
   "member_spread_deg": {
    "lat": 22.18,
    "lon": 352.1
   },
   "member_spread_now_deg": {
    "lat": 0.33,
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-08 12:02:53",
   "seed_lat": 45.06245,
   "seed_lon": 63.33336,
   "seed_alt_m": 13480.0,
   "seed_age_h": 17.29,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": 39.18087,
    "lon": -178.02565,
    "alt_m": 13886.9
   },
   "member_spread_deg": {
    "lat": 17.29,
    "lon": 356.4
   },
   "member_spread_now_deg": {
    "lat": 2.68,
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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,
   "seed_alt_m": 11370.0,
   "seed_age_h": 328.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": 48.76474,
    "lon": 42.40374,
    "alt_m": 11378.4
   },
   "member_spread_deg": {
    "lat": 80.68,
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   },
   "member_spread_now_deg": {
    "lat": 79.29,
    "lon": 300.01
   },
   "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": 216.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-15 23:30:00",
    "lat": -23.40994,
    "lon": 150.32686,
    "alt_m": 12315.0
   },
   "member_spread_deg": {
    "lat": 33.51,
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   },
   "member_spread_now_deg": {
    "lat": 24.05,
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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": 302.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-15 23:45:00",
    "lat": -5.36173,
    "lon": -17.32828,
    "alt_m": 13124.2
   },
   "member_spread_deg": {
    "lat": 29.4,
    "lon": 122.76
   },
   "member_spread_now_deg": {
    "lat": 29.31,
    "lon": 257.62
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}