{
 "generated_utc": "2026-08-09T23:27:16Z",
 "gfs_cycle_utc": "2026-08-09T18:00:00Z",
 "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_18Z.csv.gz",
  "trajectories_geojson_gz": "PBA_forecast_20260809_18Z.geojson.gz"
 },
 "counts": {
  "flights": 29,
  "members": 9,
  "rows": 139905
 },
 "flights": [
  {
   "callsign": "AG6NS-23",
   "flight_id": "AG6NS-23_2026-02-07",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 22:53:40",
   "seed_lat": -58.04167,
   "seed_lon": -168.37499,
   "seed_alt_m": 12450.0,
   "seed_age_h": 0.44,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 23:00:00",
    "lat": -41.98974,
    "lon": 78.00449,
    "alt_m": 12401.0
   },
   "member_spread_deg": {
    "lat": 17.34,
    "lon": 341.47
   },
   "member_spread_now_deg": {
    "lat": 0.16,
    "lon": 0.1
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS53",
   "flight_id": "BSS53_2026-03-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 21:05:19",
   "seed_lat": 49.47917,
   "seed_lon": -40.5,
   "seed_alt_m": 12650.0,
   "seed_age_h": 2.25,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 20:30:00",
    "lat": 61.38991,
    "lon": 77.87894,
    "alt_m": 12904.3
   },
   "member_spread_deg": {
    "lat": 39.13,
    "lon": 55.56
   },
   "member_spread_now_deg": {
    "lat": 1.06,
    "lon": 1.88
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "BSS54",
   "flight_id": "BSS54_2026-07-09",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 12:02:18",
   "seed_lat": 44.16667,
   "seed_lon": 71.33333,
   "seed_alt_m": 14180.0,
   "seed_age_h": 11.3,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 42.33384,
    "lon": -171.33399,
    "alt_m": 14548.2
   },
   "member_spread_deg": {
    "lat": 25.77,
    "lon": 334.37
   },
   "member_spread_now_deg": {
    "lat": 1.1,
    "lon": 6.47
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-23",
   "flight_id": "DG2GG-23_2026-05-23",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 21:09:00",
   "seed_lat": 42.33333,
   "seed_lon": -67.79167,
   "seed_alt_m": 12980.0,
   "seed_age_h": 2.18,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 20:45:00",
    "lat": 45.49127,
    "lon": 31.15682,
    "alt_m": 12716.9
   },
   "member_spread_deg": {
    "lat": 33.82,
    "lon": 169.41
   },
   "member_spread_now_deg": {
    "lat": 0.12,
    "lon": 0.44
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "DG2GG-27",
   "flight_id": "DG2GG-27_2026-07-04",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 22:23:00",
   "seed_lat": 16.97917,
   "seed_lon": -113.16667,
   "seed_alt_m": 14000.0,
   "seed_age_h": 0.95,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-16 22:00:00",
    "lat": 7.51453,
    "lon": -116.78437,
    "alt_m": 14040.8
   },
   "member_spread_deg": {
    "lat": 15.46,
    "lon": 87.24
   },
   "member_spread_now_deg": {
    "lat": 0.2,
    "lon": 0.26
   },
   "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": 138.38,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 34.01461,
    "lon": -29.65147,
    "alt_m": 13637.1
   },
   "member_spread_deg": {
    "lat": 77.55,
    "lon": 259.49
   },
   "member_spread_now_deg": {
    "lat": 47.72,
    "lon": 313.17
   },
   "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": 296.65,
   "float_reliable": false,
   "dead_reckoned": true,
   "levels_spanned": 4,
   "nominal_end": {
    "valid_time": "2026-08-16 17:45:00",
    "lat": 17.63717,
    "lon": 108.06752,
    "alt_m": 9037.4
   },
   "member_spread_deg": {
    "lat": 43.65,
    "lon": 338.2
   },
   "member_spread_now_deg": {
    "lat": 37.78,
    "lon": 152.16
   },
   "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": 279.73,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 72.16107,
    "lon": 64.07215,
    "alt_m": 11955.9
   },
   "member_spread_deg": {
    "lat": 46.63,
    "lon": 247.06
   },
   "member_spread_now_deg": {
    "lat": 45.17,
    "lon": 219.96
   },
   "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": 279.88,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 36.45382,
    "lon": -28.16055,
    "alt_m": 12771.6
   },
   "member_spread_deg": {
    "lat": 52.39,
    "lon": 221.63
   },
   "member_spread_now_deg": {
    "lat": 40.52,
    "lon": 88.61
   },
   "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 20:58:00",
   "seed_lat": 58.9375,
   "seed_lon": -41.125,
   "seed_alt_m": 12340.0,
   "seed_age_h": 2.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 20:30:00",
    "lat": 79.70345,
    "lon": 143.51622,
    "alt_m": 12358.6
   },
   "member_spread_deg": {
    "lat": 26.0,
    "lon": 258.34
   },
   "member_spread_now_deg": {
    "lat": 0.34,
    "lon": 0.74
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "EI6BFW-18",
   "flight_id": "EI6BFW-18_2026-07-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 21:58:00",
   "seed_lat": 69.08333,
   "seed_lon": -117.16667,
   "seed_alt_m": 12700.0,
   "seed_age_h": 1.37,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 21:30:00",
    "lat": 58.04464,
    "lon": -73.78847,
    "alt_m": 12323.9
   },
   "member_spread_deg": {
    "lat": 11.27,
    "lon": 58.61
   },
   "member_spread_now_deg": {
    "lat": 0.55,
    "lon": 0.16
   },
   "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": 21.32,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 25.95202,
    "lon": -158.33827,
    "alt_m": 13467.8
   },
   "member_spread_deg": {
    "lat": 56.02,
    "lon": 336.27
   },
   "member_spread_now_deg": {
    "lat": 3.22,
    "lon": 8.82
   },
   "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": 328.9,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 43.28407,
    "lon": -103.96185,
    "alt_m": 13114.7
   },
   "member_spread_deg": {
    "lat": 57.43,
    "lon": 276.18
   },
   "member_spread_now_deg": {
    "lat": 64.62,
    "lon": 328.7
   },
   "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 22:47:18",
   "seed_lat": 52.66667,
   "seed_lon": -45.625,
   "seed_alt_m": 13360.0,
   "seed_age_h": 0.55,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 22:15:00",
    "lat": 71.84579,
    "lon": 87.70994,
    "alt_m": 13471.7
   },
   "member_spread_deg": {
    "lat": 31.87,
    "lon": 55.26
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.24
   },
   "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": 302.2,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:45:00",
    "lat": 50.64688,
    "lon": 6.33392,
    "alt_m": 13084.4
   },
   "member_spread_deg": {
    "lat": 44.64,
    "lon": 291.61
   },
   "member_spread_now_deg": {
    "lat": 29.92,
    "lon": 317.55
   },
   "display_as": "region",
   "display_reason": "member_spread"
  },
  {
   "callsign": "KC5TRB-1",
   "flight_id": "KC5TRB-1_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 17:55:43",
   "seed_lat": 63.54161,
   "seed_lon": -33.7083,
   "seed_alt_m": 12600.0,
   "seed_age_h": 5.41,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 56.92424,
    "lon": 63.88816,
    "alt_m": 12459.7
   },
   "member_spread_deg": {
    "lat": 24.1,
    "lon": 52.72
   },
   "member_spread_now_deg": {
    "lat": 0.45,
    "lon": 0.59
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KD7FXO-1",
   "flight_id": "KD7FXO-1_2026-08-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 19:25:00",
   "seed_lat": 35.89583,
   "seed_lon": -28.16667,
   "seed_alt_m": 13120.0,
   "seed_age_h": 3.92,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 19:00:00",
    "lat": 40.97153,
    "lon": 17.60315,
    "alt_m": 12856.7
   },
   "member_spread_deg": {
    "lat": 8.32,
    "lon": 84.78
   },
   "member_spread_now_deg": {
    "lat": 0.7,
    "lon": 1.02
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE8RES-8",
   "flight_id": "KE8RES-8_2026-06-20",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 22:31:00",
   "seed_lat": 57.5625,
   "seed_lon": -97.66667,
   "seed_alt_m": 12060.0,
   "seed_age_h": 0.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 22:00:00",
    "lat": 59.1172,
    "lon": -71.85152,
    "alt_m": 11871.5
   },
   "member_spread_deg": {
    "lat": 26.29,
    "lon": 101.36
   },
   "member_spread_now_deg": {
    "lat": 0.13,
    "lon": 0.31
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "KE9DAB-11",
   "flight_id": "KE9DAB-11_2026-07-29",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 11:33:30",
   "seed_lat": 50.6875,
   "seed_lon": 67.83333,
   "seed_alt_m": 12435.0,
   "seed_age_h": 11.78,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 42.31358,
    "lon": 163.74814,
    "alt_m": 12499.4
   },
   "member_spread_deg": {
    "lat": 40.66,
    "lon": 314.15
   },
   "member_spread_now_deg": {
    "lat": 1.06,
    "lon": 2.85
   },
   "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": 192.41,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 4.70308,
    "lon": -91.85217,
    "alt_m": 12394.3
   },
   "member_spread_deg": {
    "lat": 26.41,
    "lon": 98.36
   },
   "member_spread_now_deg": {
    "lat": 17.87,
    "lon": 25.61
   },
   "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 19:25:45",
   "seed_lat": 59.56245,
   "seed_lon": -24.12498,
   "seed_alt_m": 13390.0,
   "seed_age_h": 3.91,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 19:00:00",
    "lat": 74.45847,
    "lon": 145.19513,
    "alt_m": 13284.5
   },
   "member_spread_deg": {
    "lat": 30.57,
    "lon": 114.2
   },
   "member_spread_now_deg": {
    "lat": 0.55,
    "lon": 4.93
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "SP2ROC-41",
   "flight_id": "SP2ROC-41_2026-01-25",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 21:06:00",
   "seed_lat": 52.64583,
   "seed_lon": 179.75,
   "seed_alt_m": 15750.0,
   "seed_age_h": 2.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 1,
   "nominal_end": {
    "valid_time": "2026-08-16 20:30:00",
    "lat": 8.8117,
    "lon": 131.70322,
    "alt_m": 16304.1
   },
   "member_spread_deg": {
    "lat": 36.36,
    "lon": 344.02
   },
   "member_spread_now_deg": {
    "lat": 1.08,
    "lon": 359.84
   },
   "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": 220.47,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:45:00",
    "lat": 56.20738,
    "lon": -89.60427,
    "alt_m": 13020.5
   },
   "member_spread_deg": {
    "lat": 37.6,
    "lon": 327.99
   },
   "member_spread_now_deg": {
    "lat": 19.2,
    "lon": 321.95
   },
   "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": 139.24,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 46.08108,
    "lon": -30.93833,
    "alt_m": 13303.2
   },
   "member_spread_deg": {
    "lat": 27.21,
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   },
   "member_spread_now_deg": {
    "lat": 23.22,
    "lon": 340.7
   },
   "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 11:31:00",
   "seed_lat": 48.25,
   "seed_lon": 79.70833,
   "seed_alt_m": 13270.0,
   "seed_age_h": 11.82,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 35.10409,
    "lon": -125.23057,
    "alt_m": 13383.8
   },
   "member_spread_deg": {
    "lat": 20.51,
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   },
   "member_spread_now_deg": {
    "lat": 2.08,
    "lon": 8.99
   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "callsign": "W0RBO-12",
   "flight_id": "W0RBO-12_2026-05-02",
   "payload_type": "WSPR",
   "seed_time": "2026-08-09 12:10:23",
   "seed_lat": 42.68745,
   "seed_lon": 63.83336,
   "seed_alt_m": 13420.0,
   "seed_age_h": 11.16,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:45:00",
    "lat": 43.09518,
    "lon": -131.00578,
    "alt_m": 13613.6
   },
   "member_spread_deg": {
    "lat": 10.1,
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   },
   "member_spread_now_deg": {
    "lat": 1.47,
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   },
   "display_as": "track",
   "display_reason": "fresh"
  },
  {
   "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": 234.77,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 3,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": 0.19101,
    "lon": 26.27081,
    "alt_m": 12659.5
   },
   "member_spread_deg": {
    "lat": 52.72,
    "lon": 298.2
   },
   "member_spread_now_deg": {
    "lat": 21.11,
    "lon": 152.25
   },
   "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": 15.23,
   "float_reliable": true,
   "dead_reckoned": false,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:30:00",
    "lat": -5.16619,
    "lon": 178.96286,
    "alt_m": 15772.7
   },
   "member_spread_deg": {
    "lat": 16.27,
    "lon": 282.15
   },
   "member_spread_now_deg": {
    "lat": 2.52,
    "lon": 19.95
   },
   "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": 320.0,
   "float_reliable": true,
   "dead_reckoned": true,
   "levels_spanned": 2,
   "nominal_end": {
    "valid_time": "2026-08-16 17:45:00",
    "lat": -1.94009,
    "lon": -14.23689,
    "alt_m": 13146.8
   },
   "member_spread_deg": {
    "lat": 42.15,
    "lon": 178.4
   },
   "member_spread_now_deg": {
    "lat": 30.77,
    "lon": 270.63
   },
   "display_as": "region",
   "display_reason": "member_spread"
  }
 ]
}