{
 "generated_utc": "2026-08-09T11:27:38Z",
 "gfs_cycle_utc": "2026-08-09T06:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 497.0,
  "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_06Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260809_06Z.geojson.gz"
 },
 "counts": {
  "flights": 32,
  "members": 9,
  "rows": 164412
 },
 "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": 9.19,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": -45.65307,
    "lon": 71.08726,
    "alt_m": 12417.3
   },
   "member_spread_deg": {
    "lat": 18.49,
    "lon": 80.65
   },
   "member_spread_now_deg": {
    "lat": 3.1,
    "lon": 358.57
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 12.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 58.16122,
    "lon": 86.32056,
    "alt_m": 12757.5
   },
   "member_spread_deg": {
    "lat": 16.1,
    "lon": 48.53
   },
   "member_spread_now_deg": {
    "lat": 1.97,
    "lon": 5.53
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 10:53:19",
   "seed_lat": 43.60417,
   "seed_lon": 70.25,
   "seed_alt_m": 14150.0,
   "seed_age_h": 0.45,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-16 11:00:00",
    "lat": 31.9558,
    "lon": -174.60557,
    "alt_m": 14714.1
   },
   "member_spread_deg": {
    "lat": 28.01,
    "lon": 357.7
   },
   "member_spread_now_deg": {
    "lat": 0.14,
    "lon": 0.18
   },
   "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": 12.85,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 38.39409,
    "lon": 15.54781,
    "alt_m": 12695.9
   },
   "member_spread_deg": {
    "lat": 21.44,
    "lon": 141.07
   },
   "member_spread_now_deg": {
    "lat": 3.06,
    "lon": 7.69
   },
   "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": 13.12,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 27.53176,
    "lon": -111.98235,
    "alt_m": 13959.5
   },
   "member_spread_deg": {
    "lat": 42.81,
    "lon": 93.82
   },
   "member_spread_now_deg": {
    "lat": 4.71,
    "lon": 5.83
   },
   "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": 126.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 33.16506,
    "lon": -41.20426,
    "alt_m": 13538.2
   },
   "member_spread_deg": {
    "lat": 74.78,
    "lon": 266.13
   },
   "member_spread_now_deg": {
    "lat": 48.25,
    "lon": 324.61
   },
   "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": 284.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 17.47042,
    "lon": 88.55011,
    "alt_m": 9087.7
   },
   "member_spread_deg": {
    "lat": 42.1,
    "lon": 294.16
   },
   "member_spread_now_deg": {
    "lat": 22.54,
    "lon": 145.53
   },
   "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": 267.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 49.96683,
    "lon": 57.3072,
    "alt_m": 11897.5
   },
   "member_spread_deg": {
    "lat": 31.49,
    "lon": 326.0
   },
   "member_spread_now_deg": {
    "lat": 45.16,
    "lon": 201.4
   },
   "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": 267.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 20.99247,
    "lon": -83.67288,
    "alt_m": 12725.5
   },
   "member_spread_deg": {
    "lat": 59.13,
    "lon": 203.97
   },
   "member_spread_now_deg": {
    "lat": 40.86,
    "lon": 79.06
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "DN3LEO-13",
   "flight_id": "DN3LEO-13_2026-04-12",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 10:43:00",
   "seed_lat": 59.41667,
   "seed_lon": -43.95833,
   "seed_alt_m": 12315.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 10:15:00",
    "lat": 53.56256,
    "lon": 65.56645,
    "alt_m": 12042.3
   },
   "member_spread_deg": {
    "lat": 21.79,
    "lon": 132.83
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.14
   },
   "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": 10.28,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 64.17915,
    "lon": -60.81652,
    "alt_m": 12437.2
   },
   "member_spread_deg": {
    "lat": 13.07,
    "lon": 70.77
   },
   "member_spread_now_deg": {
    "lat": 0.52,
    "lon": 2.99
   },
   "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": 9.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 42.53389,
    "lon": -160.61919,
    "alt_m": 13502.0
   },
   "member_spread_deg": {
    "lat": 43.05,
    "lon": 310.76
   },
   "member_spread_now_deg": {
    "lat": 1.17,
    "lon": 1.68
   },
   "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": 316.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 24.82378,
    "lon": -157.40656,
    "alt_m": 13279.0
   },
   "member_spread_deg": {
    "lat": 65.72,
    "lon": 328.15
   },
   "member_spread_now_deg": {
    "lat": 68.25,
    "lon": 341.44
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC3LBR-449",
   "flight_id": "KC3LBR-449_2026-07-06",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 10:57:03",
   "seed_lat": 54.4375,
   "seed_lon": -48.41667,
   "seed_alt_m": 13400.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 11:00:00",
    "lat": 66.81208,
    "lon": 75.75989,
    "alt_m": 13521.0
   },
   "member_spread_deg": {
    "lat": 28.6,
    "lon": 79.74
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.19
   },
   "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": 290.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 63.92933,
    "lon": -36.14201,
    "alt_m": 12795.3
   },
   "member_spread_deg": {
    "lat": 40.17,
    "lon": 259.08
   },
   "member_spread_now_deg": {
    "lat": 28.31,
    "lon": 352.49
   },
   "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": 18.57,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 72.39671,
    "lon": 59.65203,
    "alt_m": 12558.7
   },
   "member_spread_deg": {
    "lat": 16.84,
    "lon": 232.29
   },
   "member_spread_now_deg": {
    "lat": 3.2,
    "lon": 1.81
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 10:25:00",
   "seed_lat": 34.875,
   "seed_lon": -32.04167,
   "seed_alt_m": 13160.0,
   "seed_age_h": 0.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 10:00:00",
    "lat": 51.5353,
    "lon": 21.9326,
    "alt_m": 12922.8
   },
   "member_spread_deg": {
    "lat": 10.41,
    "lon": 80.61
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.07
   },
   "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": 12.98,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 74.44954,
    "lon": -38.53602,
    "alt_m": 12043.0
   },
   "member_spread_deg": {
    "lat": 35.86,
    "lon": 54.33
   },
   "member_spread_now_deg": {
    "lat": 2.59,
    "lon": 6.14
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 10:36:00",
   "seed_lat": 50.6875,
   "seed_lon": 67.75,
   "seed_alt_m": 12450.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 10:00:00",
    "lat": 34.04406,
    "lon": 167.94934,
    "alt_m": 12544.1
   },
   "member_spread_deg": {
    "lat": 30.71,
    "lon": 348.03
   },
   "member_spread_now_deg": {
    "lat": 0.08,
    "lon": 0.11
   },
   "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": 180.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 1.32393,
    "lon": -92.13801,
    "alt_m": 12362.7
   },
   "member_spread_deg": {
    "lat": 31.11,
    "lon": 73.57
   },
   "member_spread_now_deg": {
    "lat": 17.41,
    "lon": 17.65
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 10:55:45",
   "seed_lat": 59.43745,
   "seed_lon": -30.54165,
   "seed_alt_m": 13300.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 11:00:00",
    "lat": 72.21412,
    "lon": 126.62576,
    "alt_m": 13400.0
   },
   "member_spread_deg": {
    "lat": 22.78,
    "lon": 316.88
   },
   "member_spread_now_deg": {
    "lat": 0.03,
    "lon": 0.32
   },
   "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": 334.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 38.12603,
    "lon": -61.86537,
    "alt_m": 12008.5
   },
   "member_spread_deg": {
    "lat": 78.89,
    "lon": 334.64
   },
   "member_spread_now_deg": {
    "lat": 57.7,
    "lon": 344.89
   },
   "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": 334.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 76.69075,
    "lon": -53.63718,
    "alt_m": 13237.4
   },
   "member_spread_deg": {
    "lat": 71.93,
    "lon": 244.59
   },
   "member_spread_now_deg": {
    "lat": 41.98,
    "lon": 164.75
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 05:33:00",
   "seed_lat": 61.375,
   "seed_lon": 170.29167,
   "seed_alt_m": 15860.0,
   "seed_age_h": 5.78,
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   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
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    "lat": 46.32055,
    "lon": -165.80808,
    "alt_m": 15979.2
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 3.47,
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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,
   "seed_alt_m": 12890.0,
   "seed_age_h": 208.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 59.08482,
    "lon": -108.74058,
    "alt_m": 13171.0
   },
   "member_spread_deg": {
    "lat": 22.83,
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   },
   "member_spread_now_deg": {
    "lat": 24.24,
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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": 127.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:30:00",
    "lat": 48.60146,
    "lon": 61.33685,
    "alt_m": 12504.5
   },
   "member_spread_deg": {
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   },
   "member_spread_now_deg": {
    "lat": 21.39,
    "lon": 352.07
   },
   "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 10:31:00",
   "seed_lat": 48.10417,
   "seed_lon": 78.79167,
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   "seed_age_h": 0.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 53.03764,
    "lon": -109.62985,
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   "member_spread_now_deg": {
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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": "2026-08-09 10:42:53",
   "seed_lat": 42.68745,
   "seed_lon": 63.58336,
   "seed_alt_m": 13445.0,
   "seed_age_h": 0.62,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 42.92097,
    "lon": -172.76836,
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   "member_spread_deg": {
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   },
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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": 334.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": 67.56489,
    "lon": 40.4157,
    "alt_m": 11249.8
   },
   "member_spread_deg": {
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   },
   "member_spread_now_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": 222.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
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    "lat": -25.6531,
    "lon": 90.27755,
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   },
   "member_spread_deg": {
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   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "ZS6SRC-39",
   "flight_id": "ZS6SRC-39_2026-08-05",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 08:06:00",
   "seed_lat": -27.47917,
   "seed_lon": 86.95833,
   "seed_alt_m": 15460.0,
   "seed_age_h": 3.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
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    "lat": -7.03717,
    "lon": 172.9631,
    "alt_m": 15783.4
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   "member_spread_deg": {
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 308.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 05:45:00",
    "lat": 16.49672,
    "lon": -40.39488,
    "alt_m": 13144.9
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   "member_spread_deg": {
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   "member_spread_now_deg": {
    "lat": 31.12,
    "lon": 261.96
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}