Apparatus

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sensors Mode-S transponder

A09CAD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N139AN · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
A09CAD
Octal
50116255
Decimal
10,525,869
Country
US
Tail
N139AN
Type
A321
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
538
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S A09CAD.

Country allocation

The ICAO 24-bit address A09CAD 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
AAL903 American Airlines 14 2026-06-28
AAL702 - 9 2026-07-15
AAL1669 American Airlines 9 2026-05-02
AAL2924 American Airlines 8 2026-04-17
AAL1343 - 8 2026-06-17
AAL2742 - 7 2026-07-15
AAL1601 - 7 2026-06-17
AAL3055 - 6 2026-07-15
AAL3031 American Airlines 6 2026-05-08
AAL2612 - 6 2026-07-14
AAL2602 American Airlines 6 2026-07-25
AAL2376 - 5 2026-06-22
AAL2228 - 5 2026-07-10
AAL1852 American Airlines 5 2026-04-23
AAL870 American Airlines 4 2026-05-15
AAL3314 - 4 2026-04-14
AAL3285 American Airlines 4 2026-06-23
AAL3157 - 4 2026-07-17
AAL2945 American Airlines 4 2026-04-18
AAL2611 - 4 2026-07-04

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2759 PHL → DFW Jul 26, 21:05 UTCJul 26, 21:15 UTC10m
2026-07-26 AAL2127 LGA → DCA Jul 26, 18:25 UTCJul 26, 19:35 UTC1h 10m
2026-07-26 AAL2127 LGA → DCA Jul 26, 15:50 UTCJul 26, 17:10 UTC1h 20m
2026-07-26 AAL1525 DFW → LGA Jul 26, 12:20 UTCJul 26, 13:55 UTC1h 35m
2026-07-25 AAL1783 CLT → SFO Jul 25, 23:55 UTCJul 26, 01:05 UTC1h 10m
2026-07-25 AAL2602 DFW → CLT Jul 25, 18:55 UTCJul 25, 22:20 UTC3h 25m
2026-07-25 AAL2602 DFW → CLT Jul 25, 18:51 UTCJul 25, 22:21 UTC3h 30m
2026-07-25 AAL2602 DFW → CLT Jul 25, 13:35 UTCJul 25, 17:20 UTC3h 45m
2026-07-25 AAL2760 DCA → MIA Jul 25, 11:30 UTCJul 25, 12:05 UTC35m
2026-07-25 AAL2760 DCA → MIA Jul 25, 11:23 UTCJul 25, 12:02 UTC39m
2026-07-25 AAL2826 ORD → PHX Jul 25, 02:15 UTCJul 25, 02:40 UTC25m
2026-07-24 AAL842 PHX → SFO Jul 24, 22:34 UTCJul 25, 00:49 UTC2h 15m
2026-07-24 AAL842 PHX → SFO Jul 24, 22:35 UTCJul 25, 00:50 UTC2h 15m
2026-07-24 AAL851 LAX → PHL Jul 24, 19:35 UTCJul 24, 21:15 UTC1h 40m
2026-07-24 AAL851 LAX → PHL Jul 24, 19:32 UTCJul 24, 21:29 UTC1h 57m
2026-07-24 AAL2487 MCI → DFW Jul 24, 15:35 UTCJul 24, 18:10 UTC2h 35m
2026-07-24 AAL2487 MCI → DFW Jul 24, 12:05 UTCJul 24, 14:20 UTC2h 15m
2026-07-24 AAL1817 DFW → MSN Jul 24, 06:15 UTCJul 24, 10:30 UTC4h 15m
2026-07-24 AAL2373 SFO → CLT Jul 24, 00:40 UTCJul 24, 04:25 UTC3h 45m
2026-07-23 AAL1199 MIA → DFW Jul 23, 20:00 UTCJul 23, 22:25 UTC2h 25m
2026-07-23 AAL899 PHX → LAX Jul 23, 15:50 UTCJul 23, 17:15 UTC1h 25m
2026-07-23 AAL899 PHX → LAX Jul 23, 15:45 UTCJul 23, 18:31 UTC2h 46m
2026-07-23 AAL1655 CLT → MKE Jul 23, 12:15 UTCJul 23, 14:10 UTC1h 55m
2026-07-23 AAL1655 CLT → MKE Jul 23, 12:20 UTCJul 23, 14:15 UTC1h 55m
2026-07-23 AAL2032 PHL → RSW Jul 23, 00:00 UTCJul 23, 01:00 UTC1h 0m
2026-07-22 AAL352 CLT → DTW Jul 22, 17:40 UTCJul 22, 22:05 UTC4h 25m
2026-07-22 AAL2381 ORD → MSP Jul 22, 15:25 UTCJul 22, 15:55 UTC30m
2026-07-22 AAL2381 ORD → MSP Jul 22, 13:35 UTCJul 22, 14:05 UTC30m
2026-07-22 AAL3182 DFW → SBN Jul 22, 11:10 UTCJul 22, 12:00 UTC50m
2026-07-22 AAL2763 PHX → BOS Jul 22, 02:45 UTCJul 22, 04:15 UTC1h 30m
2026-07-21 AAL1292 LGA → ORD Jul 21, 16:15 UTCJul 21, 23:45 UTC7h 30m
2026-07-21 AAL2362 DFW → SAN Jul 21, 14:00 UTCJul 21, 14:30 UTC30m
2026-07-21 AAL2362 DFW → SAN Jul 21, 12:20 UTCJul 21, 12:50 UTC30m
2026-07-21 AAL849 DFW → BOS Jul 21, 07:25 UTCJul 21, 10:55 UTC3h 30m
2026-07-21 AAL332 LGA → MIA Jul 21, 02:35 UTCJul 21, 06:05 UTC3h 30m
2026-07-20 AAL3303 CMH → PHL Jul 20, 20:55 UTCJul 21, 00:25 UTC3h 30m
2026-07-20 AAL1625 PHX → PDX Jul 20, 17:29 UTCJul 20, 19:41 UTC2h 12m
2026-07-20 AAL1625 PHX → PDX Jul 20, 17:30 UTCJul 20, 19:40 UTC2h 10m
2026-07-20 AAL2015 MCO → PHX Jul 20, 11:50 UTCJul 20, 15:40 UTC3h 50m
2026-07-20 AAL2015 MCO → PHX Jul 20, 11:45 UTCJul 20, 15:38 UTC3h 53m
2026-07-20 AAL3176 ORD → MCO Jul 20, 00:15 UTCJul 20, 02:20 UTC2h 5m
2026-07-19 AAL2284 - Jul 19, 18:45 UTCJul 19, 22:00 UTC3h 15m
2026-07-19 AAL2284 ORD → PDX Jul 19, 13:15 UTCJul 19, 17:10 UTC3h 55m
2026-07-19 AAL2881 PHL → SFO Jul 19, 07:25 UTCJul 19, 10:40 UTC3h 15m
2026-07-19 AAL3105 DFW → MSP Jul 19, 00:30 UTCJul 19, 04:15 UTC3h 45m
2026-07-18 AAL2523 SEA → ORD Jul 18, 17:50 UTCJul 18, 21:35 UTC3h 45m
2026-07-18 AAL2523 ORD → SEA Jul 18, 12:00 UTCJul 18, 15:50 UTC3h 50m
2026-07-18 AAL2523 ORD → SEA Jul 18, 11:57 UTCJul 18, 15:50 UTC3h 53m
2026-07-18 AAL1543 ORD → SAN Jul 18, 06:25 UTCJul 18, 10:05 UTC3h 40m
2026-07-18 AAL3195 - Jul 18, 00:50 UTCJul 18, 03:15 UTC2h 26m

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 N139AN page for operator, model, and routing details .

Mode-S A09CAD frequently asked

What is Mode-S code A09CAD?
A09CAD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N139AN.
Where is Mode-S A09CAD registered?
Mode-S code A09CAD 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 A09CAD broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A09CAD, octal 50116255, decimal 10,525,869.
What flights does A09CAD operate?
Mode-S A09CAD has broadcast 20 distinct callsigns, including AAL903, AAL702, AAL1669, AAL2924, AAL1343.