Apparatus

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sensors Mode-S transponder

A65B76

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N509AY · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A65B76
Octal
51455566
Decimal
10,902,390
Country
US
Tail
N509AY
Type
A321
Transponder active on ground
Flights observed
497
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S A65B76.

Country allocation

The ICAO 24-bit address A65B76 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
AAL751 American Airlines 7 2026-04-15
AAL3031 - 6 2026-04-13
AAL2170 - 6 2026-07-04
AAL3009 - 5 2026-07-16
AAL2742 - 5 2026-07-12
AAL1949 American Airlines 5 2026-04-17
AAL851 - 4 2026-07-14
AAL573 - 4 2026-07-22
AAL461 American Airlines 4 2026-06-06
AAL3162 - 4 2026-07-14
AAL2028 American Airlines 4 2026-05-19
AAL1793 American Airlines 4 2026-06-13
AAL1181 American Airlines 4 2026-04-15
AAL1105 American Airlines 4 2026-04-17
AAL707 - 3 2026-07-12
AAL611 American Airlines 3 2026-07-03
AAL577 - 3 2026-06-26
AAL437 - 3 2026-04-13
AAL352 American Airlines 3 2026-05-23
AAL3203 - 3 2026-06-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL674 MDT → DFW Jul 26, 19:00 UTCJul 26, 21:20 UTC2h 20m
2026-07-26 AAL2857 JFK → MBJ Jul 26, 15:00 UTCJul 26, 17:15 UTC2h 15m
2026-07-26 AAL1249 LGA → MIA Jul 26, 10:15 UTCJul 26, 12:45 UTC2h 30m
2026-07-26 AAL2708 DFW → LGA Jul 26, 01:35 UTCJul 26, 04:45 UTC3h 10m
2026-07-26 AAL2708 DFW → LGA Jul 26, 01:34 UTCJul 26, 04:40 UTC3h 6m
2026-07-25 AAL3081 ELP → DFW Jul 25, 21:15 UTCJul 25, 23:45 UTC2h 30m
2026-07-25 AAL835 DCA → LGA Jul 25, 17:20 UTCJul 25, 19:50 UTC2h 30m
2026-07-25 AAL1059 CHS → PHL Jul 25, 13:50 UTCJul 25, 15:45 UTC1h 55m
2026-07-25 AAL2458 SNA → AUS Jul 25, 01:50 UTCJul 25, 04:25 UTC2h 35m
2026-07-24 AAL2458 SNA → AUS Jul 24, 22:10 UTCJul 25, 00:35 UTC2h 25m
2026-07-24 AAL1304 SJD → DFW Jul 24, 14:10 UTCJul 24, 20:00 UTC5h 50m
2026-07-24 AAL1445 LGA → DFW Jul 24, 08:50 UTCJul 24, 11:25 UTC2h 35m
2026-07-24 AAL1445 LGA → DFW Jul 24, 08:48 UTCJul 24, 11:26 UTC2h 38m
2026-07-24 AAL1504 LAX → ORD Jul 24, 04:45 UTCJul 24, 07:19 UTC2h 34m
2026-07-24 AAL1504 LAX → ORD Jul 24, 04:50 UTCJul 24, 07:25 UTC2h 35m
2026-07-24 AAL1322 DFW → DEN Jul 24, 00:50 UTCJul 24, 02:25 UTC1h 35m
2026-07-24 AAL1322 DFW → DEN Jul 24, 00:49 UTCJul 24, 02:20 UTC1h 31m
2026-07-23 AAL1322 DFW → DEN Jul 23, 21:55 UTCJul 23, 23:40 UTC1h 45m
2026-07-23 AAL2687 PHL → CHS Jul 23, 17:46 UTCJul 23, 20:25 UTC2h 39m
2026-07-23 AAL2687 PHL → CHS Jul 23, 17:50 UTCJul 23, 20:25 UTC2h 35m
2026-07-23 AAL2471 SNA → PHX Jul 23, 11:35 UTCJul 23, 15:45 UTC4h 10m
2026-07-23 AAL2471 SNA → PHX Jul 23, 11:29 UTCJul 23, 15:44 UTC4h 15m
2026-07-23 AAL2468 OAX → DFW Jul 23, 05:40 UTCJul 23, 10:00 UTC4h 20m
2026-07-23 AAL3195 DEN → PHX Jul 23, 00:40 UTCJul 23, 03:05 UTC2h 25m
2026-07-22 AAL2143 BOS → DCA Jul 22, 20:05 UTCJul 22, 22:15 UTC2h 10m
2026-07-22 AAL3271 CLT → CMH Jul 22, 17:30 UTCJul 22, 18:35 UTC1h 5m
2026-07-22 AAL573 - Jul 22, 12:55 UTCJul 22, 15:45 UTC2h 50m
2026-07-21 AAL2235 LAX → PHL Jul 21, 23:47 UTCJul 22, 01:19 UTC1h 32m
2026-07-21 AAL2235 DFW → DEN Jul 21, 23:50 UTCJul 22, 01:20 UTC1h 30m
2026-07-21 AAL2762 - Jul 21, 19:15 UTCJul 21, 21:40 UTC2h 25m
2026-07-21 AAL2762 MIA → DFW Jul 21, 19:13 UTCJul 21, 21:36 UTC2h 23m
2026-07-21 AAL2762 - Jul 21, 15:20 UTCJul 21, 17:50 UTC2h 30m
2026-07-21 AAL2558 DFW → MBJ Jul 21, 11:05 UTCJul 21, 13:35 UTC2h 30m
2026-07-20 AAL2185 PSQ → FLL Jul 20, 22:55 UTCJul 21, 01:20 UTC2h 24m
2026-07-20 AAL2185 PHL → PHL Jul 20, 22:40 UTCJul 20, 22:45 UTC5m
2026-07-20 AAL3219 CLT → MSN Jul 20, 16:53 UTCJul 20, 21:05 UTC4h 12m
2026-07-20 AAL3219 CLT → MSN Jul 20, 16:55 UTCJul 20, 21:10 UTC4h 15m
2026-07-20 AAL1459 - Jul 20, 04:05 UTCJul 20, 07:55 UTC3h 50m
2026-07-18 AAL2524 MIA → DFW Jul 18, 23:30 UTCJul 19, 02:50 UTC3h 20m
2026-07-18 AAL2524 MIA → DFW Jul 18, 17:05 UTCJul 18, 20:50 UTC3h 45m
2026-07-18 AAL465 MCO → ORD Jul 18, 12:40 UTCJul 18, 15:00 UTC2h 20m
2026-07-18 AAL563 - Jul 18, 05:05 UTCJul 18, 08:50 UTC3h 45m
2026-07-17 AAL1779 - Jul 17, 21:20 UTCJul 18, 01:15 UTC3h 55m
2026-07-17 AAL1754 DEN → CLT Jul 17, 16:19 UTCJul 17, 19:11 UTC2h 52m
2026-07-17 AAL1754 - Jul 17, 16:19 UTCJul 17, 19:15 UTC2h 55m
2026-07-17 AAL1754 - Jul 17, 11:50 UTCJul 17, 14:35 UTC2h 45m
2026-07-17 AAL1896 - Jul 17, 09:15 UTCJul 17, 10:25 UTC1h 10m
2026-07-17 AAL1879 - Jul 17, 03:05 UTCJul 17, 04:14 UTC1h 10m
2026-07-17 AAL1879 CLT → MCO Jul 17, 03:01 UTCJul 17, 04:10 UTC1h 9m
2026-07-16 AAL1735 - Jul 16, 22:10 UTCJul 17, 01:00 UTC2h 50m

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 N509AY page for operator, model, and routing details .

Mode-S A65B76 frequently asked

What is Mode-S code A65B76?
A65B76 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N509AY.
Where is Mode-S A65B76 registered?
Mode-S code A65B76 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 A65B76 broadcasting right now?
Mode-S A65B76 is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A65B76, octal 51455566, decimal 10,902,390.
What flights does A65B76 operate?
Mode-S A65B76 has broadcast 20 distinct callsigns, including AAL751, AAL3031, AAL2170, AAL3009, AAL2742.