| FlightID | ModeS Hex Code | Registration | Aircraft | Category | Airline/Operator | Callsign | Route | Time Last Seen | Possibly Landed |
|---|---|---|---|---|---|---|---|---|---|
| 4602329 | A55017 | N441UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2024-01-08 18:54:56 | |
| 4599248 | A620B7 | N494UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2024-01-07 23:01:25 | |
| 4594227 | AAEB0E | N802UA | A319 131 (A319) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2024-01-06 17:10:32 | |
| 4582499 | A070D7 | N12754 | 737NG 7V3/W (B737) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2024-01-03 16:53:49 | |
| 4578731 | A0BF8C | N14731 | 737NG 724/W (B737) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2024-01-02 16:10:08 | |
| 4575033 | A13651 | N17753 | 737NG 7V3/W (B737) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2024-01-01 16:10:13 | |
| 4571738 | A5D1B9 | N474UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-31 16:29:23 | |
| 4560405 | A0BF8C | N14731 | 737NG 724/W (B737) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-28 16:45:28 | |
| 4556286 | A1D63D | N21723 | 737NG 724/W (B737) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-27 16:52:18 | |
| 4552143 | A55785 | N443UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-26 17:00:39 | |
| 4548692 | A10E8B | N16732 | 737NG 724/W (B737) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-25 16:16:04 | |
| 4545875 | A52C4F | N432UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-24 16:39:58 | |
| 4521230 | A5D623 | N47505 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-18 20:42:36 | |
| 4516355 | A123E0 | N17262 | 737MAX 8 (B38M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-17 17:01:15 | |
| 4498939 | A524E1 | N430UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-13 16:42:54 | |
| 4490163 | A2BB83 | N27503 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-11 16:58:19 | |
| 4468904 | A6246E | N495UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-06 17:03:52 | |
| 4464460 | A533BD | N434UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-05 16:59:48 | |
| 4460107 | AA7F03 | N77573 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-04 16:56:14 | |
| 4455929 | A8D4CC | N66831 | 737NG 924ER/W (B739) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-03 17:07:46 | |
| 4452309 | A5D623 | N47505 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-02 17:08:04 | |
| 4448304 | A05E02 | N12238 | 737NG 824/W (B738) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-12-01 16:43:49 | |
| 4435232 | A553CE | N442UA | A320 232 (A320) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-28 16:39:39 | |
| 4430764 | A2B133 | N27266 | 737MAX 8 (B38M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-27 16:40:56 | |
| 4426360 | A5CC13 | N47282 | 737MAX 8 (B38M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-26 17:32:21 |