Apparatus

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sensors Mode-S transponder

AA03A2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N744YX · EMBRAER ERJ-170-200 (long wing) · operated by UNITED AIRLINES INC

Hex
AA03A2
Octal
52401642
Decimal
11,142,050
Country
US
Tail
N744YX
Type
E75L
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
633
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S AA03A2.

Country allocation

The ICAO 24-bit address AA03A2 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
RPA3694 Republic Airlines 7 2026-07-23
RPA3646 - 7 2026-06-14
RPA3580 - 7 2026-07-08
RPA3520 - 7 2026-07-05
RPA3596 Republic Airlines 6 2026-07-25
RPA3518 Republic Airlines 6 2026-06-14
RPA3479 - 6 2026-07-19
RPA3477 Republic Airlines 6 2026-07-26
RPA3443 - 6 2026-07-15
RPA3426 - 6 2026-06-30
RPA3405 Republic Airlines 6 2026-07-26
RPA3666 Republic Airlines 5 2026-07-26
RPA3645 - 5 2026-07-07
RPA3624 Republic Airlines 5 2026-06-10
RPA3610 Republic Airlines 5 2026-05-30
RPA3601 - 5 2026-07-22
RPA3599 Republic Airlines 5 2026-06-13
RPA3559 Republic Airlines 5 2026-06-09
RPA3556 Republic Airlines 5 2026-07-24
RPA3488 Republic Airlines 5 2026-05-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 RPA3666 CMH → EWR Jul 26, 21:40 UTCJul 26, 22:30 UTC50m
2026-07-26 RPA3437 BUF → EWR Jul 26, 18:40 UTCJul 26, 19:55 UTC1h 15m
2026-07-26 RPA3405 AVL → EWR Jul 26, 15:10 UTCJul 26, 16:20 UTC1h 10m
2026-07-26 RPA3405 AVL → EWR Jul 26, 15:10 UTCJul 26, 16:19 UTC1h 9m
2026-07-26 RPA3548 EWR → ITH Jul 26, 12:35 UTCJul 26, 13:40 UTC1h 5m
2026-07-26 RPA3679 BNA → EWR Jul 26, 10:20 UTCJul 26, 11:00 UTC40m
2026-07-26 RPA3477 EWR → SAV Jul 26, 03:00 UTCJul 26, 03:50 UTC50m
2026-07-26 RPA3477 EWR → SAV Jul 26, 03:01 UTCJul 26, 03:49 UTC48m
2026-07-26 RPA3644 EWR → PHL Jul 26, 00:40 UTCJul 26, 01:50 UTC1h 10m
2026-07-25 RPA3644 EWR → PHL Jul 25, 23:59 UTCJul 26, 01:47 UTC1h 48m
2026-07-25 RPA3596 EWR → PIT Jul 25, 20:35 UTCJul 25, 21:55 UTC1h 20m
2026-07-25 RPA3641 MSN → EWR Jul 25, 17:00 UTCJul 25, 18:45 UTC1h 45m
2026-07-25 RPA3669 ROC → EWR Jul 25, 13:25 UTCJul 25, 15:10 UTC1h 45m
2026-07-25 RPA3700 IND → IAD Jul 25, 10:30 UTCJul 25, 11:55 UTC1h 25m
2026-07-25 RPA3606 PIT → EWR Jul 25, 01:45 UTCJul 25, 03:15 UTC1h 30m
2026-07-24 RPA3564 CMH → EWR Jul 24, 22:05 UTCJul 25, 00:20 UTC2h 15m
2026-07-24 RPA3556 CVG → ORD Jul 24, 18:50 UTCJul 24, 20:55 UTC2h 5m
2026-07-24 RPA3448 EWR → EYW Jul 24, 15:45 UTCJul 24, 17:05 UTC1h 20m
2026-07-24 RPA3448 EWR → EYW Jul 24, 15:35 UTCJul 24, 17:05 UTC1h 30m
2026-07-24 RPA3517 EWR → YYZ Jul 24, 11:55 UTCJul 24, 13:15 UTC1h 20m
2026-07-24 RPA3711 ORF → EWR Jul 24, 00:15 UTCJul 24, 01:20 UTC1h 5m
2026-07-23 RPA3557 EWR → YYZ Jul 23, 21:30 UTCJul 23, 22:40 UTC1h 10m
2026-07-23 RPA3694 ORF → IAD Jul 23, 17:55 UTCJul 23, 19:35 UTC1h 40m
2026-07-23 RPA3421 CLT → EWR Jul 23, 14:27 UTCJul 23, 16:04 UTC1h 37m
2026-07-23 RPA3421 CLT → EWR Jul 23, 14:25 UTCJul 23, 16:05 UTC1h 40m
2026-07-23 RPA3474 EWR → MYR Jul 23, 11:10 UTCJul 23, 12:30 UTC1h 20m
2026-07-23 RPA3408 DCA → EWR Jul 23, 02:50 UTCJul 23, 03:40 UTC50m
2026-07-23 RPA3408 DCA → EWR Jul 23, 02:08 UTCJul 23, 03:42 UTC1h 34m
2026-07-22 RPA3460 YYZ → EWR Jul 22, 23:15 UTCJul 23, 00:10 UTC55m
2026-07-22 RPA3460 YYZ → EWR Jul 22, 23:18 UTCJul 23, 00:13 UTC55m
2026-07-22 RPA3531 EWR → CLT Jul 22, 20:25 UTCJul 22, 21:30 UTC1h 5m
2026-07-22 RPA3605 YYZ → EWR Jul 22, 17:29 UTCJul 22, 18:25 UTC56m
2026-07-22 RPA3605 YYZ → EWR Jul 22, 17:20 UTCJul 22, 19:10 UTC1h 50m
2026-07-22 RPA3601 - Jul 22, 14:10 UTCJul 22, 15:15 UTC1h 5m
2026-07-22 RPA3429 MEM → EWR Jul 22, 11:10 UTCJul 22, 12:10 UTC1h 0m
2026-07-22 RPA3429 MEM → EWR Jul 22, 11:18 UTCJul 22, 11:56 UTC38m
2026-07-21 RPA4099 CLE → CMH Jul 21, 21:50 UTCJul 21, 23:10 UTC1h 20m
2026-07-21 RPA3528 EWR → BUF Jul 21, 18:35 UTCJul 21, 21:00 UTC2h 25m
2026-07-21 RPA3590 YUL → IAD Jul 21, 15:40 UTCJul 21, 17:00 UTC1h 20m
2026-07-21 RPA3590 YUL → IAD Jul 21, 15:39 UTCJul 21, 16:54 UTC1h 15m
2026-07-21 RPA3536 ATL → EWR Jul 21, 12:45 UTCJul 21, 14:25 UTC1h 40m
2026-07-21 RPA3536 ATL → EWR Jul 21, 12:44 UTCJul 21, 14:23 UTC1h 39m
2026-07-21 RPA3483 EWR → GSO Jul 21, 09:40 UTCJul 21, 10:45 UTC1h 5m
2026-07-21 RPA3483 EWR → GSO Jul 21, 09:49 UTCJul 21, 10:34 UTC45m
2026-07-21 RPA3412 - Jul 21, 01:40 UTCJul 21, 03:05 UTC1h 25m
2026-07-20 RPA3527 EWR → SDF Jul 20, 22:25 UTCJul 20, 23:55 UTC1h 30m
2026-07-20 RPA3473 - Jul 20, 17:35 UTCJul 20, 19:05 UTC1h 30m
2026-07-20 RPA3405 AVL → EWR Jul 20, 15:10 UTCJul 20, 16:25 UTC1h 15m
2026-07-20 RPA3548 EWR → ITH Jul 20, 12:30 UTCJul 20, 13:40 UTC1h 10m
2026-07-19 RPA3671 - Jul 19, 17:30 UTCJul 19, 18:30 UTC1h 0m

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 N744YX page for operator, model, and routing details .

Mode-S AA03A2 frequently asked

What is Mode-S code AA03A2?
AA03A2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N744YX.
Where is Mode-S AA03A2 registered?
Mode-S code AA03A2 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 AA03A2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA03A2, octal 52401642, decimal 11,142,050.
What flights does AA03A2 operate?
Mode-S AA03A2 has broadcast 20 distinct callsigns, including RPA3694, RPA3646, RPA3580, RPA3520, RPA3596.