Apparatus

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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
No current signal · last broadcast 5h ago
Flights observed
187
Distinct callsigns
20
Country
US
Last broadcast
5h ago

Last known position

Most recent position reported by Mode-S A1A3A9.

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 - 8 2026-07-07
JBU528 - 7 2026-07-09
JBU1328 JetBlue Airways 6 2026-05-14
JBU1383 JetBlue Airways 5 2026-05-14
JBU509 JetBlue Airways 4 2026-05-06
JBU1255 JetBlue Airways 4 2026-05-30
JBU939 JetBlue Airways 3 2026-05-21
JBU787 JetBlue Airways 3 2026-06-19
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
JBU2709 JetBlue Airways 3 2026-06-08
JBU2662 JetBlue Airways 3 2026-05-08
JBU2210 JetBlue Airways 3 2026-05-13
JBU2018 JetBlue Airways 3 2026-06-10
JBU1858 - 3 2026-07-14
JBU1584 JetBlue Airways 3 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 JBU1858 - Jul 14, 20:45 UTCJul 14, 21:35 UTC50m
2026-07-14 JBU1858 - Jul 14, 17:35 UTCJul 14, 17:50 UTC15m
2026-07-14 JBU1858 AUA → JFK Jul 14, 17:31 UTCJul 14, 21:40 UTC4h 10m
2026-07-13 JBU280 MBJ → JFK Jul 13, 20:49 UTCJul 14, 17:50 UTC21h 2m
2026-07-13 JBU279 JFK → MBJ Jul 13, 15:35 UTCJul 14, 13:00 UTC21h 26m
2026-07-13 JBU135 JFK → PHX Jul 13, 00:34 UTCJul 13, 23:55 UTC23h 22m
2026-07-12 JBU156 PLS → JFK Jul 12, 18:25 UTCJul 13, 18:10 UTC23h 46m
2026-07-12 JBU255 JFK → PLS Jul 12, 13:47 UTCJul 13, 10:50 UTC21h 4m
2026-07-12 JBU58 - Jul 12, 00:25 UTCJul 12, 01:20 UTC55m
2026-07-11 JBU58 - Jul 11, 21:20 UTCJul 11, 21:30 UTC10m
2026-07-11 JBU58 AUA → JFK Jul 11, 21:15 UTCJul 12, 15:01 UTC17h 46m
2026-07-11 JBU57 - Jul 11, 19:15 UTCJul 11, 19:30 UTC15m
2026-07-11 JBU57 - Jul 11, 15:30 UTCJul 11, 18:40 UTC3h 10m
2026-07-10 JBU780 MBJ → JFK Jul 10, 17:47 UTCJul 11, 16:15 UTC22h 29m
2026-07-09 JBU1759 JFK → KIN Jul 9, 22:32 UTCJul 10, 21:10 UTC22h 39m
2026-07-09 JBU1759 - Jul 9, 22:35 UTCJul 10, 01:05 UTC2h 30m
2026-07-09 JBU788 - Jul 9, 16:05 UTCJul 9, 19:50 UTC3h 45m
2026-07-09 JBU528 GYE → JFK Jul 9, 00:00 UTCJul 9, 22:05 UTC22h 5m
2026-07-08 JBU528 FLL → JFK Jul 8, 18:40 UTCJul 9, 06:00 UTC11h 20m
2026-07-07 JBU505 JFK → FLL Jul 7, 10:00 UTCJul 7, 21:35 UTC11h 35m
2026-07-06 JBU8558 FLL → JFK Jul 6, 10:02 UTCJul 7, 01:05 UTC15h 4m
2026-07-05 JBU1975 FLL → KIN Jul 5, 22:41 UTCJul 6, 22:00 UTC23h 19m
2026-07-05 JBU8559 JFK → FLL Jul 5, 17:50 UTCJul 5, 20:15 UTC2h 25m
2026-07-05 JBU8559 JFK → FLL Jul 5, 17:46 UTCJul 6, 15:30 UTC21h 44m
2026-07-04 JBU882 - Jul 4, 23:35 UTCJul 5, 03:20 UTC3h 45m
2026-07-04 JBU704 SJU → JFK Jul 4, 02:27 UTCJul 5, 02:15 UTC23h 49m
2026-07-04 JBU704 SJU → JFK Jul 4, 02:27 UTCJul 5, 02:15 UTC23h 49m
2026-07-03 JBU788 SXM → JFK Jul 3, 15:32 UTCJul 4, 13:35 UTC22h 4m
2026-07-02 JBU466 GEO → JFK Jul 2, 22:25 UTCJul 3, 22:15 UTC23h 51m
2026-07-02 JBU466 JFK → JFK Jul 2, 15:30 UTCJul 3, 03:45 UTC12h 15m
2026-07-01 JBU2023 BOS → STI Jul 1, 17:24 UTCJul 2, 16:05 UTC22h 41m
2026-07-01 JBU2023 - Jul 1, 17:25 UTCJul 1, 18:10 UTC45m
2026-06-30 JBU8358 MBJ → EWR Jun 30, 14:40 UTCJun 30, 16:45 UTC2h 5m
2026-06-30 JBU8358 MBJ → EWR Jun 30, 14:35 UTCJul 1, 04:20 UTC13h 45m
2026-06-24 JBU1770 GYE → MCO Jun 24, 12:19 UTCJun 24, 17:25 UTC5h 6m
2026-06-23 JBU280 MBJ → JFK Jun 23, 20:13 UTCJun 24, 17:25 UTC21h 12m
2026-06-23 JBU279 - Jun 23, 15:15 UTCJun 23, 22:15 UTC7h 0m
2026-06-22 JBU859 JFK → JFK Jun 22, 18:24 UTCJun 23, 03:20 UTC8h 55m
2026-06-19 JBU787 JFK → SXM Jun 19, 10:24 UTCJun 19, 19:09 UTC8h 45m
2026-06-18 JBU18 JFK → JFK Jun 18, 20:45 UTCJun 19, 07:04 UTC10h 19m
2026-06-18 JBU602 - Jun 18, 16:00 UTCJun 18, 18:25 UTC2h 25m
2026-06-18 JBU1601 JFK → FLL Jun 18, 10:55 UTCJun 18, 13:15 UTC2h 20m
2026-06-17 JBU1669 JFK → JFK Jun 17, 15:15 UTCJun 18, 00:25 UTC9h 10m
2026-06-16 JBU117 - Jun 16, 15:15 UTCJun 16, 18:35 UTC3h 20m
2026-06-16 JBU117 JFK → POS Jun 16, 15:13 UTCJun 17, 01:35 UTC10h 23m
2026-06-15 JBU488 MCO → ORH Jun 15, 08:20 UTCJun 15, 13:05 UTC4h 45m
2026-06-15 JBU488 MCO → ORH Jun 15, 08:16 UTCJun 16, 01:50 UTC17h 34m
2026-06-15 JBU823 JFK → LAX Jun 15, 00:15 UTCJun 15, 06:30 UTC6h 15m
2026-06-14 JBU156 PLS → JFK Jun 14, 19:55 UTCJun 14, 21:15 UTC1h 20m
2026-06-14 JBU255 JFK → PLS Jun 14, 13:20 UTCJun 14, 13:50 UTC30m

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 .

Mode-S A1A3A9 frequently asked

What is Mode-S code A1A3A9?
A1A3A9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N2043J.
Where is Mode-S A1A3A9 registered?
Mode-S code A1A3A9 is allocated to United States (US). All aircraft registered there receive a Mode-S address from a fixed block defined by ICAO Annex 10.
Is A1A3A9 broadcasting right now?
No active broadcast right now. Last signal was 5h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A1A3A9, octal 50321651, decimal 10,593,193.
What flights does A1A3A9 operate?
Mode-S A1A3A9 has broadcast 20 distinct callsigns, including JBU1329, JBU505, JBU528, JBU1328, JBU1383.