Apparatus

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sensors Mode-S transponder

AD945A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N974UY · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
AD945A
Octal
53312132
Decimal
11,375,706
Country
US
Tail
N974UY
Type
A321
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
500
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AD945A.

Country allocation

The ICAO 24-bit address AD945A 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
AAL2109 - 10 2026-07-13
AAL2791 American Airlines 9 2026-06-01
AAL2634 - 7 2026-07-11
AAL1577 - 7 2026-06-21
N974UY - 6 2026-07-05
AAL2003 - 6 2026-07-14
AAL1919 - 6 2026-07-18
AAL757 American Airlines 5 2026-04-15
AAL702 American Airlines 4 2026-07-20
AAL582 American Airlines 4 2026-05-16
AAL381 - 4 2026-07-14
AAL3250 - 4 2026-07-13
AAL3157 - 4 2026-07-12
AAL2878 American Airlines 4 2026-05-16
AAL2459 - 4 2026-07-06
AAL2279 American Airlines 4 2026-05-30
AAL812 - 3 2026-07-05
AAL799 - 3 2026-07-12
AAL777 American Airlines 3 2026-04-22
AAL575 American Airlines 3 2026-05-30

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL3164 PSP → PHX Jul 26, 17:35 UTCJul 26, 22:15 UTC4h 40m
2026-07-26 AAL2070 CLT → LAX Jul 26, 11:15 UTCJul 26, 15:30 UTC4h 15m
2026-07-26 AAL2793 CLT → SEA Jul 26, 04:55 UTCJul 26, 09:10 UTC4h 16m
2026-07-25 AAL3105 DFW → MSP Jul 25, 22:55 UTCJul 26, 03:05 UTC4h 10m
2026-07-25 AAL2523 BOS → DCA Jul 25, 17:50 UTCJul 25, 21:05 UTC3h 15m
2026-07-25 AAL2523 BOS → DCA Jul 25, 12:15 UTCJul 25, 16:15 UTC4h 0m
2026-07-25 AAL2977 BOS → DCA Jul 25, 07:25 UTCJul 25, 10:50 UTC3h 25m
2026-07-25 AAL2977 BOS → DCA Jul 25, 02:25 UTCJul 25, 06:20 UTC3h 55m
2026-07-24 AAL2636 DFW → PHL Jul 24, 21:20 UTCJul 24, 23:45 UTC2h 25m
2026-07-24 AAL3240 CLT → IND Jul 24, 16:20 UTCJul 24, 17:20 UTC1h 0m
2026-07-24 AAL3240 CLT → IND Jul 24, 16:19 UTCJul 24, 18:38 UTC2h 19m
2026-07-24 AAL3289 SBN → DFW Jul 24, 11:56 UTCJul 24, 14:54 UTC2h 58m
2026-07-24 AAL3289 SBN → DFW Jul 24, 12:00 UTCJul 24, 14:55 UTC2h 55m
2026-07-22 AAL3289 SBN → DFW Jul 22, 13:32 UTCJul 22, 16:44 UTC3h 12m
2026-07-22 AAL2054 PHX → MIA Jul 22, 00:05 UTCJul 22, 03:35 UTC3h 30m
2026-07-22 AAL2054 PHX → MIA Jul 22, 00:03 UTCJul 22, 03:32 UTC3h 29m
2026-07-21 AAL1643 PHL → MSY Jul 21, 19:10 UTCJul 21, 21:35 UTC2h 25m
2026-07-21 AAL1046 DCA → PWM Jul 21, 13:45 UTCJul 21, 16:10 UTC2h 25m
2026-07-21 AAL1046 DCA → PWM Jul 21, 13:41 UTCJul 21, 16:07 UTC2h 26m
2026-07-21 AAL2289 - Jul 21, 06:50 UTCJul 21, 11:40 UTC4h 50m
2026-07-20 AAL2766 LAX → DFW Jul 20, 23:50 UTCJul 21, 02:25 UTC2h 35m
2026-07-20 AAL2766 LAX → DFW Jul 20, 23:47 UTCJul 21, 02:23 UTC2h 36m
2026-07-20 AAL1475 CLE → PHL Jul 20, 21:05 UTCJul 20, 22:25 UTC1h 20m
2026-07-20 AAL1475 CLE → PHL Jul 20, 21:01 UTCJul 20, 22:25 UTC1h 24m
2026-07-20 AAL1475 CLE → PHL Jul 20, 18:15 UTCJul 20, 19:45 UTC1h 30m
2026-07-20 AAL1090 DEN → DFW Jul 20, 15:15 UTCJul 20, 16:45 UTC1h 30m
2026-07-20 AAL662P DFW → DEN Jul 20, 12:25 UTCJul 20, 13:55 UTC1h 30m
2026-07-20 AAL662P DFW → DEN Jul 20, 12:24 UTCJul 20, 13:53 UTC1h 29m
2026-07-20 AAL2742 - Jul 20, 07:05 UTCJul 20, 09:30 UTC2h 25m
2026-07-20 AAL2742 - Jul 20, 05:15 UTCJul 20, 05:25 UTC10m
2026-07-20 AAL2742 SJU → DFW Jul 20, 05:10 UTCJul 20, 09:35 UTC4h 25m
2026-07-20 AAL702 DFW → SJU Jul 20, 03:15 UTCJul 20, 03:25 UTC10m
2026-07-19 AAL702 DFW → SJU Jul 19, 23:10 UTCJul 20, 01:35 UTC2h 25m
2026-07-19 AAL2762 - Jul 19, 18:55 UTCJul 19, 21:30 UTC2h 35m
2026-07-19 AAL2762 DFW → MIA Jul 19, 14:55 UTCJul 19, 17:45 UTC2h 50m
2026-07-19 AAL2762 DFW → DFW Jul 19, 13:35 UTCJul 19, 13:45 UTC10m
2026-07-19 AAL2928 AUS → DFW Jul 19, 12:30 UTCJul 19, 13:10 UTC40m
2026-07-19 AAL972 DFW → AUS Jul 19, 04:10 UTCJul 19, 04:40 UTC30m
2026-07-19 AAL1698 - Jul 19, 00:25 UTCJul 19, 02:35 UTC2h 10m
2026-07-18 AAL1919 - Jul 18, 20:55 UTCJul 18, 22:50 UTC1h 55m
2026-07-18 AAL1919 IAH → CLT Jul 18, 20:54 UTCJul 18, 22:56 UTC2h 2m
2026-07-18 AAL1919 - Jul 18, 17:40 UTCJul 18, 19:35 UTC1h 55m
2026-07-18 AAL1266 - Jul 18, 14:35 UTCJul 18, 16:05 UTC1h 30m
2026-07-18 AAL608 - Jul 18, 03:10 UTCJul 18, 04:35 UTC1h 25m
2026-07-18 AAL1861 - Jul 18, 00:25 UTCJul 18, 01:54 UTC1h 30m
2026-07-17 AAL1861 - Jul 17, 21:34 UTCJul 17, 23:00 UTC1h 25m
2026-07-17 AAL859 - Jul 17, 18:50 UTCJul 17, 20:04 UTC1h 15m
2026-07-17 AAL859 - Jul 17, 15:10 UTCJul 17, 16:40 UTC1h 30m
2026-07-17 AAL1525 - Jul 17, 12:10 UTCJul 17, 13:20 UTC1h 10m
2026-07-16 AAL1783 - Jul 16, 23:35 UTCJul 17, 00:45 UTC1h 10m

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 N974UY page for operator, model, and routing details .

Mode-S AD945A frequently asked

What is Mode-S code AD945A?
AD945A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N974UY.
Where is Mode-S AD945A registered?
Mode-S code AD945A 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 AD945A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AD945A, octal 53312132, decimal 11,375,706.
What flights does AD945A operate?
Mode-S AD945A has broadcast 20 distinct callsigns, including AAL2109, AAL2791, AAL2634, AAL1577, N974UY.