{
 "generated_utc": "2026-08-05T17:27:22Z",
 "gfs_cycle_utc": "2026-08-05T12:00:00Z",
 "model": {
  "source": "NCEP GFS 0.50 degree",
  "vertical_coordinate": "constant density (isopycnic)",
  "horizon_hours": 479.5,
  "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_12Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260805_12Z.geojson.gz"
 },
 "counts": {
  "flights": 35,
  "members": 9,
  "rows": 177021
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:48:40",
   "seed_lat": -42.02084,
   "seed_lon": -12.83332,
   "seed_alt_m": 12780.0,
   "seed_age_h": 0.52,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 16:15:00",
    "lat": -37.82947,
    "lon": -116.71747,
    "alt_m": 12740.2
   },
   "member_spread_deg": {
    "lat": 15.98,
    "lon": 60.86
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "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": 287.67,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 47.42385,
    "lon": -87.06074,
    "alt_m": 13041.7
   },
   "member_spread_deg": {
    "lat": 34.04,
    "lon": 255.41
   },
   "member_spread_now_deg": {
    "lat": 53.79,
    "lon": 343.31
   },
   "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": 8.26,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 60.55601,
    "lon": 86.12624,
    "alt_m": 12489.1
   },
   "member_spread_deg": {
    "lat": 56.9,
    "lon": 235.44
   },
   "member_spread_now_deg": {
    "lat": 8.42,
    "lon": 3.46
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:20:48",
   "seed_lat": 51.75,
   "seed_lon": 7.66667,
   "seed_alt_m": 14000.0,
   "seed_age_h": 0.99,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-12 15:45:00",
    "lat": 53.97831,
    "lon": 156.72843,
    "alt_m": 14158.7
   },
   "member_spread_deg": {
    "lat": 34.61,
    "lon": 71.58
   },
   "member_spread_now_deg": {
    "lat": 0.23,
    "lon": 0.49
   },
   "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": 14.43,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 34.89817,
    "lon": -94.79816,
    "alt_m": 13239.6
   },
   "member_spread_deg": {
    "lat": 24.56,
    "lon": 99.86
   },
   "member_spread_now_deg": {
    "lat": 3.01,
    "lon": 8.89
   },
   "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": 273.97,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 71.54552,
    "lon": 40.41605,
    "alt_m": 12497.8
   },
   "member_spread_deg": {
    "lat": 35.7,
    "lon": 316.3
   },
   "member_spread_now_deg": {
    "lat": 37.04,
    "lon": 202.76
   },
   "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": 15.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 35.52233,
    "lon": -77.59611,
    "alt_m": 13904.6
   },
   "member_spread_deg": {
    "lat": 46.94,
    "lon": 159.55
   },
   "member_spread_now_deg": {
    "lat": 3.37,
    "lon": 7.5
   },
   "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": 36.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 36.57896,
    "lon": -133.95662,
    "alt_m": 13489.2
   },
   "member_spread_deg": {
    "lat": 77.02,
    "lon": 341.27
   },
   "member_spread_now_deg": {
    "lat": 10.51,
    "lon": 9.48
   },
   "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": 194.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 38.61146,
    "lon": 73.74832,
    "alt_m": 9076.6
   },
   "member_spread_deg": {
    "lat": 46.82,
    "lon": 315.61
   },
   "member_spread_now_deg": {
    "lat": 43.42,
    "lon": 125.37
   },
   "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": 265.35,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 50.10573,
    "lon": -2.78855,
    "alt_m": 8721.7
   },
   "member_spread_deg": {
    "lat": 36.76,
    "lon": 341.08
   },
   "member_spread_now_deg": {
    "lat": 38.16,
    "lon": 356.57
   },
   "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": 177.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 53.53786,
    "lon": 32.84752,
    "alt_m": 12363.5
   },
   "member_spread_deg": {
    "lat": 57.12,
    "lon": 251.41
   },
   "member_spread_now_deg": {
    "lat": 38.07,
    "lon": 72.14
   },
   "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": 177.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 32.42355,
    "lon": -61.32204,
    "alt_m": 12768.5
   },
   "member_spread_deg": {
    "lat": 50.92,
    "lon": 151.19
   },
   "member_spread_now_deg": {
    "lat": 39.42,
    "lon": 48.88
   },
   "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": 9.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 61.00597,
    "lon": 99.00466,
    "alt_m": 12180.1
   },
   "member_spread_deg": {
    "lat": 32.91,
    "lon": 260.66
   },
   "member_spread_now_deg": {
    "lat": 7.79,
    "lon": 356.81
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "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": 293.07,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 70.2415,
    "lon": -123.00256,
    "alt_m": 15210.8
   },
   "member_spread_deg": {
    "lat": 21.09,
    "lon": 343.13
   },
   "member_spread_now_deg": {
    "lat": 18.49,
    "lon": 319.98
   },
   "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 16:38:00",
   "seed_lat": 68.27083,
   "seed_lon": -129.0,
   "seed_alt_m": 13070.0,
   "seed_age_h": 0.7,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 16:15:00",
    "lat": 54.10218,
    "lon": 41.29217,
    "alt_m": 12852.9
   },
   "member_spread_deg": {
    "lat": 49.72,
    "lon": 241.11
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 0.55
   },
   "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": 317.08,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 54.41648,
    "lon": -59.6146,
    "alt_m": 13422.1
   },
   "member_spread_deg": {
    "lat": 82.1,
    "lon": 290.11
   },
   "member_spread_now_deg": {
    "lat": 50.31,
    "lon": 354.43
   },
   "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": 6.74,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 13.25738,
    "lon": -157.08884,
    "alt_m": 13409.7
   },
   "member_spread_deg": {
    "lat": 57.45,
    "lon": 343.92
   },
   "member_spread_now_deg": {
    "lat": 2.13,
    "lon": 2.46
   },
   "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": 226.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 34.47257,
    "lon": -175.0036,
    "alt_m": 13198.1
   },
   "member_spread_deg": {
    "lat": 56.55,
    "lon": 318.63
   },
   "member_spread_now_deg": {
    "lat": 67.02,
    "lon": 299.43
   },
   "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 16:57:03",
   "seed_lat": 48.5625,
   "seed_lon": -95.70833,
   "seed_alt_m": 13330.0,
   "seed_age_h": 0.38,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:00:00",
    "lat": 58.07847,
    "lon": 95.95688,
    "alt_m": 13222.2
   },
   "member_spread_deg": {
    "lat": 18.1,
    "lon": 184.56
   },
   "member_spread_now_deg": {
    "lat": 0.11,
    "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": 200.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 51.04854,
    "lon": -115.06122,
    "alt_m": 13124.0
   },
   "member_spread_deg": {
    "lat": 54.23,
    "lon": 344.69
   },
   "member_spread_now_deg": {
    "lat": 27.21,
    "lon": 272.22
   },
   "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": 77.82,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 62.89464,
    "lon": 85.10026,
    "alt_m": 12562.7
   },
   "member_spread_deg": {
    "lat": 43.89,
    "lon": 327.64
   },
   "member_spread_now_deg": {
    "lat": 33.32,
    "lon": 331.06
   },
   "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 16:15:00",
   "seed_lat": 49.16667,
   "seed_lon": -117.33333,
   "seed_alt_m": 12740.0,
   "seed_age_h": 1.08,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 15:45:00",
    "lat": 56.19048,
    "lon": 78.67265,
    "alt_m": 12587.6
   },
   "member_spread_deg": {
    "lat": 17.68,
    "lon": 101.7
   },
   "member_spread_now_deg": {
    "lat": 0.37,
    "lon": 0.78
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:36:00",
   "seed_lat": 56.64583,
   "seed_lon": -84.75,
   "seed_alt_m": 12060.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 16:00:00",
    "lat": 56.71977,
    "lon": -109.55637,
    "alt_m": 12232.8
   },
   "member_spread_deg": {
    "lat": 13.55,
    "lon": 62.88
   },
   "member_spread_now_deg": {
    "lat": 0.09,
    "lon": 0.11
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:36:00",
   "seed_lat": 46.375,
   "seed_lon": 7.625,
   "seed_alt_m": 12390.0,
   "seed_age_h": 0.73,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 16:00:00",
    "lat": 58.21589,
    "lon": 127.39061,
    "alt_m": 12308.2
   },
   "member_spread_deg": {
    "lat": 22.15,
    "lon": 37.92
   },
   "member_spread_now_deg": {
    "lat": 0.07,
    "lon": 0.12
   },
   "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": 90.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 20.51463,
    "lon": -122.41962,
    "alt_m": 12261.7
   },
   "member_spread_deg": {
    "lat": 25.83,
    "lon": 63.24
   },
   "member_spread_now_deg": {
    "lat": 13.06,
    "lon": 7.35
   },
   "display_as": "region",
   "display_reason": "seed_age"
  },
  {
   "callsign": "KI6DS-11",
   "flight_id": "KI6DS-11_2026-02-03",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 16:55:45",
   "seed_lat": 86.58328,
   "seed_lon": -32.87498,
   "seed_alt_m": 12960.0,
   "seed_age_h": 0.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 17:00:00",
    "lat": 68.75959,
    "lon": 89.22285,
    "alt_m": 13172.3
   },
   "member_spread_deg": {
    "lat": 19.23,
    "lon": 76.63
   },
   "member_spread_now_deg": {
    "lat": 0.19,
    "lon": 1.52
   },
   "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": 244.56,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 35.04281,
    "lon": 171.12802,
    "alt_m": 12189.1
   },
   "member_spread_deg": {
    "lat": 53.18,
    "lon": 340.42
   },
   "member_spread_now_deg": {
    "lat": 55.68,
    "lon": 338.51
   },
   "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": 244.01,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 60.23668,
    "lon": -50.07145,
    "alt_m": 13520.5
   },
   "member_spread_deg": {
    "lat": 33.49,
    "lon": 213.52
   },
   "member_spread_now_deg": {
    "lat": 39.74,
    "lon": 354.9
   },
   "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",
   "seed_lat": 58.91667,
   "seed_lon": 107.79167,
   "seed_alt_m": 15600.0,
   "seed_age_h": 7.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 31.01829,
    "lon": -173.0496,
    "alt_m": 16201.4
   },
   "member_spread_deg": {
    "lat": 35.37,
    "lon": 356.12
   },
   "member_spread_now_deg": {
    "lat": 1.65,
    "lon": 2.71
   },
   "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": 118.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 47.60392,
    "lon": -164.15723,
    "alt_m": 13231.0
   },
   "member_spread_deg": {
    "lat": 33.66,
    "lon": 340.1
   },
   "member_spread_now_deg": {
    "lat": 34.77,
    "lon": 339.7
   },
   "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": 37.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": 49.85667,
    "lon": -53.6197,
    "alt_m": 12676.4
   },
   "member_spread_deg": {
    "lat": 35.75,
    "lon": 330.79
   },
   "member_spread_now_deg": {
    "lat": 10.89,
    "lon": 9.19
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "VE3VRO-36",
   "flight_id": "VE3VRO-36_2026-07-30",
   "payload_type": "WSPR",
   "seed_time": "2026-08-05 15:56:00",
   "seed_lat": 48.91667,
   "seed_lon": 0.58333,
   "seed_alt_m": 13250.0,
   "seed_age_h": 1.4,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 15:30:00",
    "lat": 48.17352,
    "lon": 159.911,
    "alt_m": 13435.3
   },
   "member_spread_deg": {
    "lat": 30.6,
    "lon": 332.45
   },
   "member_spread_now_deg": {
    "lat": 0.22,
    "lon": 0.88
   },
   "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": 244.5,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": 52.98903,
    "lon": -26.14004,
    "alt_m": 11457.4
   },
   "member_spread_deg": {
    "lat": 93.61,
    "lon": 271.93
   },
   "member_spread_now_deg": {
    "lat": 52.68,
    "lon": 352.64
   },
   "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": 132.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-12 11:30:00",
    "lat": -16.66511,
    "lon": 41.75401,
    "alt_m": 12599.4
   },
   "member_spread_deg": {
    "lat": 24.66,
    "lon": 217.46
   },
   "member_spread_now_deg": {
    "lat": 26.34,
    "lon": 220.41
   },
   "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": 218.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-12 11:45:00",
    "lat": -11.4325,
    "lon": -63.25858,
    "alt_m": 13122.2
   },
   "member_spread_deg": {
    "lat": 25.7,
    "lon": 281.95
   },
   "member_spread_now_deg": {
    "lat": 28.3,
    "lon": 293.04
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}