Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A3F91E

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N355TW · operated by AMERICAN AIRLINES INC

Hex
A3F91E
Octal
50774436
Decimal
10,746,142
Country
US
Tail
N355TW
Type
B38M
No current signal · last broadcast Jul 26, 20:05 UTC
Flights observed
497
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:05 UTC

Last known position

Most recent position reported by Mode-S A3F91E.

Country allocation

The ICAO 24-bit address A3F91E 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
AAL1137 - 12 2026-06-21
AAL2689 American Airlines 6 2026-07-25
AAL2309 - 6 2026-06-17
AAL1772 American Airlines 6 2026-06-19
AAL1653 - 6 2026-07-02
AAL1253 American Airlines 6 2026-04-16
AAL1209 American Airlines 6 2026-07-23
AAL2897 American Airlines 5 2026-05-30
AAL1130 American Airlines 5 2026-06-22
AAL1122 American Airlines 5 2026-04-24
AAL518 - 4 2026-07-07
AAL412 - 4 2026-04-14
AAL3316 American Airlines 4 2026-06-11
AAL2916 American Airlines 4 2026-05-15
AAL2799 - 4 2026-07-12
AAL2738 - 4 2026-06-22
AAL264 American Airlines 4 2026-07-26
AAL2463 American Airlines 4 2026-07-20
AAL2437 American Airlines 4 2026-07-22
AAL2004 American Airlines 4 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL264 MEX → MIA Jul 26, 17:20 UTCJul 26, 17:30 UTC10m
2026-07-26 AAL264 MEX → MIA Jul 26, 17:19 UTCJul 26, 20:13 UTC2h 54m
2026-07-26 AAL264 MEX → MIA Jul 26, 12:45 UTCJul 26, 13:30 UTC45m
2026-07-26 AAL264 MEX → MIA Jul 26, 12:45 UTCJul 26, 15:36 UTC2h 51m
2026-07-26 AAL2654 LAS → ORD Jul 26, 06:40 UTCJul 26, 10:50 UTC4h 10m
2026-07-25 AAL2689 ORD → BDL Jul 25, 23:45 UTCJul 26, 04:35 UTC4h 50m
2026-07-25 AAL2689 ORD → BDL Jul 25, 16:40 UTCJul 25, 21:00 UTC4h 20m
2026-07-25 AAL1808 - Jul 25, 14:15 UTCJul 25, 15:00 UTC45m
2026-07-25 AAL1808 LAS → PHX Jul 25, 14:14 UTCJul 25, 14:59 UTC45m
2026-07-25 AAL3076 UVF → JFK Jul 25, 02:55 UTCJul 25, 07:15 UTC4h 20m
2026-07-24 AAL3119 ORD → LGA Jul 24, 22:45 UTCJul 25, 01:25 UTC2h 40m
2026-07-24 AAL3119 ORD → LGA Jul 24, 22:44 UTCJul 25, 01:20 UTC2h 36m
2026-07-24 AAL1997 PHL → TPA Jul 24, 16:34 UTCJul 24, 20:49 UTC4h 15m
2026-07-24 AAL1997 PHL → TPA Jul 24, 16:35 UTCJul 24, 20:50 UTC4h 15m
2026-07-24 AAL1694 TPA → DFW Jul 24, 13:10 UTCJul 24, 14:45 UTC1h 35m
2026-07-24 AAL1197 MKE → CLT Jul 24, 04:30 UTCJul 24, 06:00 UTC1h 30m
2026-07-24 AAL1197 MKE → CLT Jul 24, 04:29 UTCJul 24, 05:58 UTC1h 29m
2026-07-23 AAL3191 LGA → MIA Jul 23, 22:45 UTCJul 24, 03:00 UTC4h 15m
2026-07-23 AAL3283 LAX → DCA Jul 23, 16:05 UTCJul 23, 20:40 UTC4h 35m
2026-07-23 AAL1209 PHL → PHX Jul 23, 04:25 UTCJul 23, 08:05 UTC3h 40m
2026-07-23 AAL1209 PHL → PHX Jul 23, 04:24 UTCJul 23, 08:02 UTC3h 38m
2026-07-22 AAL2437 SJU → DFW Jul 22, 21:45 UTCJul 23, 00:20 UTC2h 35m
2026-07-22 AAL2437 SJU → DFW Jul 22, 18:00 UTCJul 22, 20:15 UTC2h 15m
2026-07-22 AAL3100 LGA → ORD Jul 22, 14:10 UTCJul 22, 16:25 UTC2h 15m
2026-07-21 AAL388 DFW → PHL Jul 21, 16:15 UTCJul 21, 18:50 UTC2h 35m
2026-07-21 AAL388 DFW → PHL Jul 21, 16:12 UTCJul 21, 18:49 UTC2h 37m
2026-07-21 AAL392 PHL → PVD Jul 21, 12:00 UTCJul 21, 14:20 UTC2h 20m
2026-07-21 AAL392 PHL → PVD Jul 21, 12:05 UTCJul 21, 14:25 UTC2h 20m
2026-07-20 AAL952 PHL → DFW Jul 20, 21:50 UTCJul 21, 00:25 UTC2h 34m
2026-07-20 AAL1918 CLT → SFO Jul 20, 16:40 UTCJul 20, 19:15 UTC2h 35m
2026-07-20 AAL1918 CLT → SFO Jul 20, 12:55 UTCJul 20, 15:10 UTC2h 15m
2026-07-20 AAL1480 HNL → LAX Jul 20, 06:25 UTCJul 20, 11:15 UTC4h 50m
2026-07-20 AAL2463 SNA → PHX Jul 20, 00:30 UTCJul 20, 05:00 UTC4h 30m
2026-07-20 AAL2463 SNA → PHX Jul 20, 00:26 UTCJul 20, 04:56 UTC4h 30m
2026-07-19 AAL914 CTG → MIA Jul 19, 22:15 UTCJul 19, 22:40 UTC25m
2026-07-19 AAL914 CTG → MIA Jul 19, 20:26 UTCJul 19, 22:40 UTC2h 14m
2026-07-19 AAL914 CTG → MIA Jul 19, 20:30 UTCJul 19, 20:45 UTC15m
2026-07-19 AAL2173 - Jul 19, 16:35 UTCJul 19, 18:55 UTC2h 20m
2026-07-19 AAL3154 DFW → CMH Jul 19, 12:30 UTCJul 19, 14:15 UTC1h 45m
2026-07-18 AAL2657 SEA → DFW Jul 18, 23:10 UTCJul 19, 01:10 UTC2h 0m
2026-07-18 AAL2249 - Jul 18, 19:30 UTCJul 18, 19:55 UTC25m
2026-07-18 AAL2249 - Jul 18, 17:10 UTCJul 18, 17:30 UTC20m
2026-07-18 AAL1103 - Jul 18, 15:15 UTCJul 18, 15:40 UTC25m
2026-07-18 AAL1103 - Jul 18, 12:50 UTCJul 18, 13:05 UTC15m
2026-07-18 AAL2654 - Jul 18, 06:20 UTCJul 18, 10:30 UTC4h 10m
2026-07-18 AAL2689 JFK → PHX Jul 18, 00:00 UTCJul 18, 04:35 UTC4h 36m
2026-07-17 AAL2689 - Jul 17, 16:49 UTCJul 17, 21:25 UTC4h 35m
2026-07-17 AAL1808 LAS → PHX Jul 17, 14:14 UTCJul 17, 15:04 UTC50m
2026-07-17 AAL1808 LAS → PHX Jul 17, 14:15 UTCJul 17, 15:00 UTC45m
2026-07-17 AAL2106 - Jul 17, 07:40 UTCJul 17, 08:35 UTC55m

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 N355TW page for operator, model, and routing details .

Mode-S A3F91E frequently asked

What is Mode-S code A3F91E?
A3F91E is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N355TW.
Where is Mode-S A3F91E registered?
Mode-S code A3F91E 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 A3F91E broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3F91E, octal 50774436, decimal 10,746,142.
What flights does A3F91E operate?
Mode-S A3F91E has broadcast 20 distinct callsigns, including AAL1137, AAL2689, AAL2309, AAL1772, AAL1653.