Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC72E4

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N901AA · AIRBUS A-321 · operated by AMERICAN AIRLINES INC

Hex
AC72E4
Octal
53071344
Decimal
11,301,604
Country
US
Tail
N901AA
Type
A321
Transponder active on ground
Flights observed
487
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AC72E4.

Country allocation

The ICAO 24-bit address AC72E4 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
AAL1669 American Airlines 7 2026-04-13
AAL2534 American Airlines 6 2026-06-07
AAL338 American Airlines 5 2026-07-22
AAL2656 American Airlines 5 2026-06-15
AAL1832 American Airlines 5 2026-06-10
AAL1584 American Airlines 5 2026-06-16
AAL783 American Airlines 4 2026-06-03
AAL484 - 4 2026-06-23
AAL3001 - 4 2026-06-20
AAL2636 American Airlines 4 2026-05-18
AAL2611 - 4 2026-06-18
AAL2458 - 4 2026-07-07
AAL2105 - 4 2026-07-03
AAL1986 - 4 2026-07-22
AAL1852 American Airlines 4 2026-04-21
AAL1810 American Airlines 4 2026-04-15
AAL1322 American Airlines 4 2026-07-20
AA0013 - 4 2026-07-15
AAL830 American Airlines 3 2026-05-17
AAL727 American Airlines 3 2026-07-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL1415 YVR → DFW Jul 26, 20:25 UTCJul 26, 23:00 UTC2h 35m
2026-07-26 AAL1415 YVR → DFW Jul 26, 13:45 UTCJul 26, 17:25 UTC3h 40m
2026-07-26 AAL727 CLT → PHX Jul 26, 02:04 UTCJul 26, 05:19 UTC3h 15m
2026-07-26 AAL727 CLT → PHX Jul 26, 02:05 UTCJul 26, 05:20 UTC3h 15m
2026-07-25 AAL727 CLT → PHX Jul 25, 20:50 UTCJul 26, 00:30 UTC3h 40m
2026-07-25 AAL3045 ORD → TPA Jul 25, 12:15 UTCJul 25, 19:15 UTC7h 0m
2026-07-25 AAL3314 SMF → DFW Jul 25, 07:10 UTCJul 25, 10:05 UTC2h 55m
2026-07-25 AAL3314 SMF → DFW Jul 25, 07:07 UTCJul 25, 10:00 UTC2h 53m
2026-07-25 AAL3314 SMF → DFW Jul 25, 02:45 UTCJul 25, 05:55 UTC3h 10m
2026-07-24 AAL1862 PHL → PIT Jul 24, 22:20 UTCJul 25, 01:00 UTC2h 40m
2026-07-24 AAL1862 PHL → PIT Jul 24, 22:14 UTCJul 25, 00:51 UTC2h 37m
2026-07-24 AAL1862 PHL → PIT Jul 24, 18:30 UTCJul 24, 21:05 UTC2h 35m
2026-07-24 AAL2305 SFO → DFW Jul 24, 14:00 UTCJul 24, 17:10 UTC3h 10m
2026-07-24 AAL2556 PWM → PHL Jul 24, 00:00 UTCJul 24, 04:45 UTC4h 45m
2026-07-23 AAL1486 - Jul 23, 20:25 UTCJul 23, 21:30 UTC1h 5m
2026-07-23 AAL1486 BNA → CLT Jul 23, 20:25 UTCJul 23, 21:26 UTC1h 1m
2026-07-23 AAL3073 PHX → BNA Jul 23, 15:46 UTCJul 23, 18:54 UTC3h 8m
2026-07-23 AAL3073 - Jul 23, 15:50 UTCJul 23, 19:00 UTC3h 10m
2026-07-23 AAL1854 ORD → PHL Jul 23, 11:30 UTCJul 23, 13:30 UTC2h 0m
2026-07-23 AAL1854 ORD → PHL Jul 23, 11:29 UTCJul 23, 13:29 UTC2h 0m
2026-07-23 AAL3136 DFW → LAX Jul 23, 07:25 UTCJul 23, 09:55 UTC2h 30m
2026-07-23 AAL2364 LAX → ORD Jul 23, 02:10 UTCJul 23, 05:45 UTC3h 35m
2026-07-22 AAL338 LGA → MIA Jul 22, 19:25 UTCJul 22, 22:20 UTC2h 55m
2026-07-22 AAL1986 - Jul 22, 14:20 UTCJul 22, 17:55 UTC3h 35m
2026-07-22 AAL2842 SFO → MIA Jul 22, 11:35 UTCJul 22, 11:45 UTC10m
2026-07-22 AAL3014 BOS → CLT Jul 22, 02:55 UTCJul 22, 04:30 UTC1h 35m
2026-07-22 AAL2100 - Jul 22, 00:00 UTCJul 22, 01:15 UTC1h 15m
2026-07-21 AAL2100 - Jul 21, 21:40 UTCJul 21, 22:45 UTC1h 5m
2026-07-21 AAL851 - Jul 21, 17:40 UTCJul 21, 19:20 UTC1h 40m
2026-07-21 AAL1886 - Jul 21, 13:55 UTCJul 21, 16:10 UTC2h 15m
2026-07-21 AAL972P - Jul 21, 12:10 UTCJul 21, 12:40 UTC30m
2026-07-20 AAL1322 DFW → DEN Jul 20, 02:10 UTCJul 20, 03:40 UTC1h 30m
2026-07-19 AAL1322 DFW → DEN Jul 19, 23:00 UTCJul 20, 00:35 UTC1h 35m
2026-07-19 AAL1186 - Jul 19, 18:15 UTCJul 19, 21:10 UTC2h 55m
2026-07-19 AAL33 JFK → LAX Jul 19, 11:30 UTCJul 19, 16:30 UTC5h 0m
2026-07-18 AAL1052 - Jul 18, 14:25 UTCJul 18, 17:00 UTC2h 35m
2026-07-18 AAL1052 MIA → JFK Jul 18, 14:24 UTCJul 18, 16:51 UTC2h 27m
2026-07-18 AAL3189 AEX → DFW Jul 18, 10:15 UTCJul 18, 13:10 UTC2h 55m
2026-07-18 AAL2603 PHX → DFW Jul 18, 03:35 UTCJul 18, 05:35 UTC2h 0m
2026-07-17 AAL186 CUN → PHX Jul 17, 21:25 UTCJul 18, 01:10 UTC3h 45m
2026-07-17 AAL186 CUN → PHX Jul 17, 21:23 UTCJul 18, 01:09 UTC3h 46m
2026-07-17 AAL515 - Jul 17, 16:29 UTCJul 17, 20:04 UTC3h 35m
2026-07-16 AAL1648 - Jul 16, 23:20 UTCJul 17, 01:15 UTC1h 55m
2026-07-16 AAL2407 - Jul 16, 17:20 UTCJul 16, 19:30 UTC2h 10m
2026-07-16 AAL573 - Jul 16, 12:49 UTCJul 16, 15:40 UTC2h 50m
2026-07-16 AAL2500 PHL → DEN Jul 16, 00:35 UTCJul 16, 03:40 UTC3h 5m
2026-07-15 - PHL → PHL Jul 15, 13:15 UTCJul 15, 13:20 UTC5m
2026-07-15 - PHL → PHL Jul 15, 12:50 UTCJul 15, 12:55 UTC5m
2026-07-15 AA0013 PHL → PHL Jul 15, 06:45 UTCJul 15, 06:50 UTC5m
2026-07-13 AA0013 PHL → PHL Jul 13, 21:15 UTCJul 13, 21:20 UTC5m

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 N901AA page for operator, model, and routing details .

Mode-S AC72E4 frequently asked

What is Mode-S code AC72E4?
AC72E4 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N901AA.
Where is Mode-S AC72E4 registered?
Mode-S code AC72E4 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 AC72E4 broadcasting right now?
Mode-S AC72E4 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 AC72E4, octal 53071344, decimal 11,301,604.
What flights does AC72E4 operate?
Mode-S AC72E4 has broadcast 20 distinct callsigns, including AAL1669, AAL2534, AAL338, AAL2656, AAL1832.