Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A9B275

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N724AN · BOEING 777-300ER · operated by AMERICAN AIRLINES INC

Hex
A9B275
Octal
52331165
Decimal
11,121,269
Country
US
Tail
N724AN
Type
B77W
No current signal · last broadcast 2h ago
Flights observed
227
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A9B275.

Country allocation

The ICAO 24-bit address A9B275 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
AAL51 American Airlines 18 2026-07-08
AAL731 American Airlines 13 2026-07-07
AAL72 - 13 2026-07-11
AAL929 - 11 2026-06-19
AAL73 - 11 2026-07-11
AAL101 American Airlines 11 2026-05-14
AAL100 American Airlines 11 2026-05-08
AAL930 - 10 2026-06-20
AAL20 - 10 2026-06-15
AAL142 American Airlines 10 2026-07-06
AAL954 - 9 2026-07-06
AAL78 - 9 2026-07-10
AAL730 - 9 2026-07-07
AAL735 - 8 2026-07-13
AAL39 American Airlines 8 2026-06-16
AAL141 - 8 2026-07-04
AAL734 - 7 2026-07-14
AAL217 - 7 2026-07-09
AAL137 - 7 2026-07-10
AAL136 - 7 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL734 - Jul 14, 03:55 UTCJul 14, 11:20 UTC7h 25m
2026-07-13 AAL735 - Jul 13, 14:45 UTCJul 13, 22:35 UTC7h 50m
2026-07-13 AAL735 LHR → CLT Jul 13, 14:43 UTCJul 13, 22:37 UTC7h 54m
2026-07-13 AAL136 - Jul 13, 01:25 UTCJul 13, 04:30 UTC3h 5m
2026-07-13 AAL136 LAX → LHR Jul 13, 01:24 UTCJul 13, 11:17 UTC9h 53m
2026-07-11 AAL72 - Jul 11, 23:35 UTCJul 12, 00:05 UTC30m
2026-07-11 AAL72 SYD → LAX Jul 11, 23:33 UTCJul 12, 12:27 UTC12h 54m
2026-07-11 AAL72 SYD → LAX Jul 11, 23:33 UTCJul 12, 12:31 UTC12h 58m
2026-07-11 AAL73 - Jul 11, 06:30 UTCJul 11, 06:55 UTC25m
2026-07-11 AAL73 LAX → SYD Jul 11, 06:28 UTCJul 11, 20:36 UTC14h 8m
2026-07-10 AAL137 - Jul 10, 16:20 UTCJul 11, 01:00 UTC8h 40m
2026-07-10 AAL137 LHR → LAX Jul 10, 16:15 UTCJul 11, 02:38 UTC10h 23m
2026-07-10 AAL78 DFW → LHR Jul 10, 04:30 UTCJul 10, 13:00 UTC8h 30m
2026-07-09 AAL217 ATH → DFW Jul 9, 11:45 UTCJul 10, 00:10 UTC12h 25m
2026-07-08 AAL216 DFW → ATH Jul 8, 21:25 UTCJul 9, 08:40 UTC11h 15m
2026-07-08 AAL51 LHR → DFW Jul 8, 08:35 UTCJul 8, 17:15 UTC8h 40m
2026-07-08 AAL51 LHR → DFW Jul 8, 08:10 UTCJul 8, 08:30 UTC20m
2026-07-07 AAL730 - Jul 7, 22:20 UTCJul 8, 05:25 UTC7h 5m
2026-07-07 AAL730 CLT → LHR Jul 7, 22:16 UTCJul 8, 05:27 UTC7h 11m
2026-07-07 AAL731 LHR → CLT Jul 7, 08:50 UTCJul 7, 17:00 UTC8h 10m
2026-07-07 AAL731 LHR → CLT Jul 7, 08:49 UTCJul 7, 16:57 UTC8h 8m
2026-07-06 AAL142 JFK → LHR Jul 6, 14:12 UTCJul 6, 20:26 UTC6h 14m
2026-07-06 AAL142 JFK → LHR Jul 6, 14:15 UTCJul 6, 19:15 UTC5h 0m
2026-07-06 AAL954 - Jul 6, 00:20 UTCJul 6, 00:55 UTC35m
2026-07-06 AAL954 EZE → JFK Jul 6, 00:20 UTCJul 6, 10:16 UTC9h 56m
2026-07-05 AAL953 - Jul 5, 05:00 UTCJul 5, 15:10 UTC10h 10m
2026-07-04 AAL141 - Jul 4, 17:20 UTCJul 4, 18:40 UTC1h 20m
2026-07-04 AAL141 LHR → JFK Jul 4, 17:19 UTCJul 5, 00:32 UTC7h 13m
2026-07-04 AAL734 - Jul 4, 04:10 UTCJul 4, 06:45 UTC2h 35m
2026-07-04 AAL734 CLT → LHR Jul 4, 04:08 UTCJul 4, 11:16 UTC7h 8m
2026-07-03 AAL735 AUA → LGA Jul 3, 14:35 UTCJul 3, 22:40 UTC8h 5m
2026-07-03 AAL734 - Jul 3, 03:25 UTCJul 3, 10:30 UTC7h 5m
2026-07-02 AAL735 AUA → LGA Jul 2, 14:35 UTCJul 2, 22:50 UTC8h 15m
2026-07-02 AAL136 - Jul 2, 01:25 UTCJul 2, 11:15 UTC9h 50m
2026-06-30 AAL72 HNL → ORD Jun 30, 23:45 UTCJul 1, 12:45 UTC13h 0m
2026-06-30 AAL73 - Jun 30, 06:40 UTCJun 30, 07:05 UTC25m
2026-06-30 AAL73 LAX → SYD Jun 30, 06:36 UTCJun 30, 20:41 UTC14h 5m
2026-06-29 AAL137 - Jun 29, 16:19 UTCJun 30, 02:45 UTC10h 26m
2026-06-29 AAL78 DFW → LHR Jun 29, 04:34 UTCJun 29, 13:04 UTC8h 30m
2026-06-28 AAL81 - Jun 28, 16:14 UTCJun 29, 01:25 UTC9h 10m
2026-06-28 AAL734 - Jun 28, 03:59 UTCJun 28, 11:14 UTC7h 15m
2026-06-27 AAL735 AUA → LGA Jun 27, 15:24 UTCJun 27, 23:14 UTC7h 50m
2026-06-27 AAL735 AUA → LGA Jun 27, 15:22 UTCJun 27, 23:09 UTC7h 47m
2026-06-27 AAL136 - Jun 27, 01:54 UTCJun 27, 12:09 UTC10h 15m
2026-06-25 AAL72 HNL → ORD Jun 25, 23:58 UTCJun 26, 13:08 UTC13h 10m
2026-06-25 AAL72 HNL → ORD Jun 25, 23:59 UTCJun 26, 12:59 UTC13h 0m
2026-06-25 AAL73 - Jun 25, 06:30 UTCJun 25, 07:00 UTC30m
2026-06-25 AAL73 LAX → SYD Jun 25, 06:29 UTCJun 25, 20:43 UTC14h 14m
2026-06-24 AAL137 - Jun 24, 16:24 UTCJun 25, 02:59 UTC10h 35m
2026-06-24 AAL136 - Jun 24, 01:34 UTCJun 24, 11:20 UTC9h 45m

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 N724AN page for operator, model, and routing details .

Mode-S A9B275 frequently asked

What is Mode-S code A9B275?
A9B275 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N724AN.
Where is Mode-S A9B275 registered?
Mode-S code A9B275 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 A9B275 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9B275, octal 52331165, decimal 11,121,269.
What flights does A9B275 operate?
Mode-S A9B275 has broadcast 20 distinct callsigns, including AAL51, AAL731, AAL72, AAL929, AAL73.