sensors Mode-S transponder
A1A3A9
ICAO 24-bit transponder address · allocated to United States
Currently assigned to N2043J · AIRBUS A-321neo · operated by UMB BANK N.A. TRUSTEE
- Hex
- A1A3A9
- Octal
- 50321651
- Decimal
- 10,593,193
- Country
- US
- Tail
- N2043J
- Type
- A21N
- Flights observed
- 214
- Distinct callsigns
- 20
- Country
- US
- Last broadcast
- Jul 26, 22:15 UTC
Last known position
Country allocation
The ICAO 24-bit address A1A3A9 falls within the block assigned to United States (US) by ICAO Annex 10, Volume III. Every aircraft registered in United States receives a permanent address from this block at the time of registration; the address stays with the airframe even if the aircraft is re-registered to a different operator within the country.
Callsign history 20 distinct
| Callsign | Airline | Flights | Last seen |
|---|---|---|---|
| JBU1329 | JetBlue Airways | 12 | 2026-05-15 |
| JBU505 | - | 10 | 2026-07-16 |
| JBU528 | - | 9 | 2026-07-17 |
| JBU1328 | JetBlue Airways | 6 | 2026-05-14 |
| JBU1383 | JetBlue Airways | 5 | 2026-05-14 |
| JBU788 | - | 4 | 2026-07-20 |
| JBU787 | - | 4 | 2026-07-20 |
| JBU509 | JetBlue Airways | 4 | 2026-05-06 |
| JBU309 | JetBlue Airways | 4 | 2026-07-22 |
| JBU1256 | - | 4 | 2026-07-16 |
| JBU1255 | JetBlue Airways | 4 | 2026-05-30 |
| JBU939 | JetBlue Airways | 3 | 2026-05-21 |
| JBU662 | JetBlue Airways | 3 | 2026-06-05 |
| JBU58 | - | 3 | 2026-07-12 |
| JBU569 | JetBlue Airways | 3 | 2026-04-20 |
| JBU470 | JetBlue Airways | 3 | 2026-05-04 |
| JBU466 | - | 3 | 2026-07-02 |
| JBU279 | - | 3 | 2026-07-15 |
| JBU2709 | JetBlue Airways | 3 | 2026-06-08 |
| JBU2662 | JetBlue Airways | 3 | 2026-05-08 |
Recent flights last 50
| Date | Flight | Route | Takeoff | Landing | Duration |
|---|---|---|---|---|---|
| 2026-07-26 | JBU1852 | CUN → JFK | Jul 26, 20:00 UTC | Jul 26, 22:15 UTC | 2h 15m |
| 2026-07-26 | JBU1851 | JFK → CUN | Jul 26, 14:55 UTC | Jul 26, 18:15 UTC | 3h 20m |
| 2026-07-26 | JBU18 | FLL → JAX | Jul 26, 02:10 UTC | Jul 26, 07:20 UTC | 5h 11m |
| 2026-07-25 | JBU17 | JFK → FLL | Jul 25, 18:45 UTC | Jul 26, 00:00 UTC | 5h 15m |
| 2026-07-25 | JBU904 | SJU → JFK | Jul 25, 14:25 UTC | Jul 25, 16:15 UTC | 1h 50m |
| 2026-07-25 | JBU904 | SJU → JFK | Jul 25, 12:30 UTC | Jul 25, 12:45 UTC | 15m |
| 2026-07-25 | JBU2903 | JFK → SJU | Jul 25, 02:00 UTC | Jul 25, 05:10 UTC | 3h 10m |
| 2026-07-24 | JBU407 | PWM → JFK | Jul 24, 22:10 UTC | Jul 24, 22:55 UTC | 45m |
| 2026-07-24 | JBU508 | - | Jul 24, 19:25 UTC | Jul 24, 20:05 UTC | 40m |
| 2026-07-24 | JBU384 | MCO → JFK | Jul 24, 14:35 UTC | Jul 24, 16:50 UTC | 2h 15m |
| 2026-07-24 | JBU883 | JFK → MCO | Jul 24, 10:40 UTC | Jul 24, 12:50 UTC | 2h 10m |
| 2026-07-23 | JBU1669 | BOS → FLL | Jul 23, 17:45 UTC | Jul 24, 03:20 UTC | 9h 35m |
| 2026-07-22 | JBU309 | IAD → FLL | Jul 22, 23:30 UTC | Jul 23, 14:45 UTC | 15h 15m |
| 2026-07-22 | JBU268 | PUJ → JFK | Jul 22, 17:30 UTC | Jul 22, 20:45 UTC | 3h 15m |
| 2026-07-21 | JBU1669 | JFK → PUJ | Jul 21, 16:56 UTC | Jul 21, 17:40 UTC | 44m |
| 2026-07-20 | JBU309 | IAD → FLL | Jul 20, 22:53 UTC | Jul 21, 17:40 UTC | 18h 47m |
| 2026-07-20 | JBU309 | IAD → FLL | Jul 20, 22:55 UTC | Jul 21, 01:50 UTC | 2h 54m |
| 2026-07-20 | JBU788 | - | Jul 20, 16:20 UTC | Jul 20, 19:35 UTC | 3h 15m |
| 2026-07-20 | JBU787 | - | Jul 20, 10:25 UTC | Jul 20, 14:00 UTC | 3h 35m |
| 2026-07-19 | JBU309 | IAD → FLL | Jul 19, 05:29 UTC | Jul 19, 14:15 UTC | 8h 47m |
| 2026-07-18 | JBU788 | SXM → JFK | Jul 18, 15:26 UTC | Jul 19, 14:15 UTC | 22h 50m |
| 2026-07-17 | JBU528 | GYE → JFK | Jul 17, 21:57 UTC | Jul 18, 19:55 UTC | 21h 59m |
| 2026-07-17 | JBU528 | - | Jul 17, 16:29 UTC | Jul 18, 04:00 UTC | 11h 31m |
| 2026-07-16 | JBU1256 | GYE → FLL | Jul 16, 18:49 UTC | Jul 17, 18:15 UTC | 23h 26m |
| 2026-07-16 | JBU505 | - | Jul 16, 10:50 UTC | Jul 16, 13:15 UTC | 2h 25m |
| 2026-07-16 | JBU505 | JFK → GYE | Jul 16, 10:49 UTC | Jul 17, 03:55 UTC | 17h 6m |
| 2026-07-15 | JBU279 | JFK → JFK | Jul 15, 14:25 UTC | Jul 15, 23:05 UTC | 8h 40m |
| 2026-07-14 | JBU1858 | - | Jul 14, 20:45 UTC | Jul 14, 21:35 UTC | 50m |
| 2026-07-14 | JBU1858 | - | Jul 14, 17:35 UTC | Jul 14, 17:50 UTC | 15m |
| 2026-07-14 | JBU1858 | AUA → JFK | Jul 14, 17:31 UTC | Jul 15, 16:15 UTC | 22h 44m |
| 2026-07-13 | JBU280 | MBJ → JFK | Jul 13, 20:49 UTC | Jul 14, 17:50 UTC | 21h 2m |
| 2026-07-13 | JBU279 | JFK → MBJ | Jul 13, 15:35 UTC | Jul 14, 13:00 UTC | 21h 26m |
| 2026-07-13 | JBU135 | JFK → PHX | Jul 13, 00:34 UTC | Jul 13, 23:55 UTC | 23h 22m |
| 2026-07-12 | JBU156 | PLS → JFK | Jul 12, 18:25 UTC | Jul 13, 18:10 UTC | 23h 46m |
| 2026-07-12 | JBU255 | JFK → PLS | Jul 12, 13:47 UTC | Jul 13, 10:50 UTC | 21h 4m |
| 2026-07-12 | JBU58 | - | Jul 12, 00:25 UTC | Jul 12, 01:20 UTC | 55m |
| 2026-07-11 | JBU58 | - | Jul 11, 21:20 UTC | Jul 11, 21:30 UTC | 10m |
| 2026-07-11 | JBU58 | AUA → JFK | Jul 11, 21:15 UTC | Jul 12, 15:01 UTC | 17h 46m |
| 2026-07-11 | JBU57 | - | Jul 11, 19:15 UTC | Jul 11, 19:30 UTC | 15m |
| 2026-07-11 | JBU57 | - | Jul 11, 15:30 UTC | Jul 11, 18:40 UTC | 3h 10m |
| 2026-07-10 | JBU780 | MBJ → JFK | Jul 10, 17:47 UTC | Jul 11, 16:15 UTC | 22h 29m |
| 2026-07-09 | JBU1759 | JFK → KIN | Jul 9, 22:32 UTC | Jul 10, 21:10 UTC | 22h 39m |
| 2026-07-09 | JBU1759 | - | Jul 9, 22:35 UTC | Jul 10, 01:05 UTC | 2h 30m |
| 2026-07-09 | JBU788 | - | Jul 9, 16:05 UTC | Jul 9, 19:50 UTC | 3h 45m |
| 2026-07-09 | JBU528 | GYE → JFK | Jul 9, 00:00 UTC | Jul 9, 22:05 UTC | 22h 5m |
| 2026-07-08 | JBU528 | FLL → JFK | Jul 8, 18:40 UTC | Jul 9, 06:00 UTC | 11h 20m |
| 2026-07-07 | JBU505 | JFK → FLL | Jul 7, 10:00 UTC | Jul 7, 21:35 UTC | 11h 35m |
| 2026-07-06 | JBU8558 | FLL → JFK | Jul 6, 10:02 UTC | Jul 7, 01:05 UTC | 15h 4m |
| 2026-07-05 | JBU1975 | FLL → KIN | Jul 5, 22:41 UTC | Jul 6, 22:00 UTC | 23h 19m |
| 2026-07-05 | JBU8559 | JFK → FLL | Jul 5, 17:50 UTC | Jul 5, 20:15 UTC | 2h 25m |
About Mode-S
A Mode-S transponder code (also called an "ICAO 24-bit address" or "hex code") is a 6-character hexadecimal identifier permanently assigned to an aircraft when it's first registered. Unlike callsigns (which change with each flight) or registrations (which can change if an aircraft is sold internationally), the Mode-S address stays with the airframe for the life of the aircraft in that country.
Every ADS-B transmission from an aircraft includes its Mode-S address, making it the most reliable way to identify a specific airframe. Flight-tracking services like Apparatus use the Mode-S address as the primary key for tying position broadcasts, callsigns, and ownership records together.
Prefer a tail-number view? See the N2043J page for operator, model, and routing details .