Apparatus

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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
Broadcasting now · callsign AAL137 · 32,000 ft
Flights observed
256
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Current position

A9B275 is currently broadcasting. Map zoomed to live position.

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
AAL72 American Airlines 18 2026-07-25
AAL51 American Airlines 18 2026-07-08
AAL73 American Airlines 16 2026-07-24
AAL731 American Airlines 13 2026-07-07
AAL137 American Airlines 12 2026-07-23
AAL929 - 11 2026-06-19
AAL101 American Airlines 11 2026-05-14
AAL100 American Airlines 11 2026-05-08
AAL930 - 10 2026-06-20
AAL735 American Airlines 10 2026-07-26
AAL20 - 10 2026-06-15
AAL142 American Airlines 10 2026-07-06
AAL136 American Airlines 10 2026-07-26
AAL954 - 9 2026-07-06
AAL78 - 9 2026-07-10
AAL730 - 9 2026-07-07
AAL39 American Airlines 8 2026-06-16
AAL141 - 8 2026-07-04
AAL79 American Airlines 7 2026-07-22
AAL734 - 7 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL735 AUA → LGA Jul 26, 14:25 UTCJul 26, 15:15 UTC50m
2026-07-26 AAL735 AUA → LGA Jul 26, 14:25 UTCJul 26, 22:25 UTC8h 0m
2026-07-26 AAL136 LAX → LHR Jul 26, 01:25 UTCJul 26, 10:45 UTC9h 21m
2026-07-25 AAL72 HNL → ORD Jul 25, 11:50 UTCJul 25, 12:30 UTC40m
2026-07-24 AAL72 HNL → ORD Jul 24, 23:30 UTCJul 25, 00:20 UTC50m
2026-07-24 AAL73 LAX → SYD Jul 24, 06:55 UTCJul 24, 07:20 UTC25m
2026-07-24 AAL73 LAX → SYD Jul 24, 06:52 UTCJul 24, 20:53 UTC14h 1m
2026-07-23 AAL137 LHR → LAX Jul 23, 16:20 UTCJul 24, 02:55 UTC10h 35m
2026-07-23 AAL80 DFW → LHR Jul 23, 02:55 UTCJul 23, 11:25 UTC8h 30m
2026-07-22 AAL79 LHR → DFW Jul 22, 14:35 UTCJul 22, 23:45 UTC9h 10m
2026-07-22 AAL136 LAX → LHR Jul 22, 01:35 UTCJul 22, 11:25 UTC9h 50m
2026-07-20 AAL72 HNL → ORD Jul 20, 23:54 UTCJul 21, 13:15 UTC13h 21m
2026-07-20 AAL72 HNL → ORD Jul 20, 23:55 UTCJul 21, 13:05 UTC13h 10m
2026-07-20 AAL73 LAX → SYD Jul 20, 06:35 UTCJul 20, 21:25 UTC14h 50m
2026-07-19 AAL137 LHR → LAX Jul 19, 16:35 UTCJul 20, 02:50 UTC10h 15m
2026-07-19 AAL137 LHR → LAX Jul 19, 16:35 UTCJul 20, 02:50 UTC10h 15m
2026-07-19 AAL80 DFW → LHR Jul 19, 02:55 UTCJul 19, 11:45 UTC8h 50m
2026-07-18 AAL79 LHR → DFW Jul 18, 14:25 UTCJul 18, 15:35 UTC1h 10m
2026-07-18 AAL79 LHR → DFW Jul 18, 14:20 UTCJul 18, 23:20 UTC9h 0m
2026-07-18 AAL79 LHR → DFW Jul 18, 14:20 UTCJul 18, 23:16 UTC8h 56m
2026-07-18 AAL136 LAX → LHR Jul 18, 01:45 UTCJul 18, 11:35 UTC9h 51m
2026-07-16 AAL72 - Jul 16, 23:40 UTCJul 17, 13:05 UTC13h 25m
2026-07-16 AAL73 - Jul 16, 06:15 UTCJul 16, 06:40 UTC25m
2026-07-16 AAL73 LAX → SYD Jul 16, 06:11 UTCJul 16, 20:29 UTC14h 18m
2026-07-15 AAL137 - Jul 15, 16:25 UTCJul 15, 17:15 UTC50m
2026-07-15 AAL137 LHR → LAX Jul 15, 16:24 UTCJul 16, 02:55 UTC10h 31m
2026-07-15 AAL80 DFW → LHR Jul 15, 02:45 UTCJul 15, 11:40 UTC8h 55m
2026-07-14 AAL79 - Jul 14, 13:55 UTCJul 14, 15:05 UTC1h 10m
2026-07-14 AAL79 LHR → DFW Jul 14, 13:54 UTCJul 14, 22:56 UTC9h 2m
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

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?
Yes. Mode-S A9B275 is currently airborne.
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 AAL72, AAL51, AAL73, AAL731, AAL137.