| FlightID | ModeS Hex Code | Registration | Aircraft | Category | Airline/Operator | Callsign | Route | Time Last Seen | Possibly Landed |
|---|---|---|---|---|---|---|---|---|---|
| 4410465 | A2B133 | N27266 | 737MAX 8 (B38M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-22 16:28:53 | |
| 4405675 | AA56B5 | N76516 | 737NG 824/W (B738) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-21 17:12:14 | |
| 4392716 | A126E8 | N17312 | 737MAX 8 (B38M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-18 16:31:18 | |
| 4388643 | A123E0 | N17262 | 737MAX 8 (B38M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-17 17:06:10 | |
| 4360618 | A2BBF2 | N27539 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-11-11 16:34:26 | |
| 4334493 | A2BBA4 | N27511 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KDEN (DEN) to KMCI (MCI) | 2023-11-05 16:56:53 | |
| 4316701 | A05DBC | N12218 | 737NG 824/W (B738) | Jet | United Airlines | UAL421 | KDEN (DEN) to KMCI (MCI) | 2023-11-01 16:55:20 | |
| 4009138 | AA7E9B | N77544 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KMCI (MCI) | 2023-08-31 06:24:55 | |
| 3998639 | A449A4 | N37563 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KMCI (MCI) | 2023-08-29 06:46:54 | |
| 3978076 | A449A1 | N37560 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KMCI (MCI) | 2023-08-25 07:13:58 | |
| 3939497 | A4491A | N37525 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-08-17 06:32:26 | |
| 3934062 | A5D68A | N47533 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-08-16 07:07:45 | |
| 3929000 | A4493F | N37537 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-08-15 06:35:59 | |
| 3904589 | AA7E9A | N77543 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-08-10 07:12:42 | |
| 3894327 | A44964 | N37549 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-08-08 07:00:55 | |
| 3848322 | A448D6 | N37507 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-30 07:07:51 | |
| 3818066 | A92365 | N68805 | 737NG 924ER/W (B739) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-24 06:31:59 | |
| 3809398 | A4493A | N37532 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-22 06:58:46 | |
| 3804219 | A44938 | N37530 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-21 07:03:09 | |
| 3787906 | A4495D | N37542 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-18 07:03:32 | |
| 3768320 | A837A6 | N62895 | 737NG 900ER/W (B739) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-14 07:09:56 | |
| 3747200 | A2BBF2 | N27539 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-10 06:57:05 | |
| 3742859 | A12EE7 | N17557 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-09 07:01:14 | |
| 3723741 | A449A3 | N37562 | 737MAX 9 (B39M) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-05 06:35:09 | |
| 3714912 | A494C5 | N39450 | 737NG 924ER/W (B739) | Jet | United Airlines | UAL421 | KBOS (BOS) to KIAH (IAH) | 2023-07-03 06:36:34 |