Apparatus

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sensors Mode-S transponder

AC4A44

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N891NN · BOEING 737-800 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
AC4A44
Octal
53045104
Decimal
11,291,204
Country
US
Tail
N891NN
Type
B738
No current signal · last broadcast Jul 26, 23:00 UTC
Flights observed
514
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 23:00 UTC

Last known position

Most recent position reported by Mode-S AC4A44.

Country allocation

The ICAO 24-bit address AC4A44 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
AAL1927 American Airlines 6 2026-05-01
AAL3238 - 5 2026-07-15
AAL2906 American Airlines 5 2026-07-25
AAL2066 American Airlines 5 2026-07-23
AAL1680 - 5 2026-06-24
AAL790 - 4 2026-06-21
AAL3175 - 4 2026-06-20
AAL2682 - 4 2026-07-13
AAL2449 - 4 2026-07-10
AAL2439 American Airlines 4 2026-06-16
AAL2382 American Airlines 4 2026-06-11
AAL1792 - 4 2026-06-23
AAL1624 - 4 2026-07-05
AAL1327 American Airlines 4 2026-07-23
AAL1134 American Airlines 4 2026-07-23
AAL1041 - 4 2026-07-12
AAL935 - 3 2026-06-19
AAL914 American Airlines 3 2026-07-22
AAL864 American Airlines 3 2026-06-05
AAL814 American Airlines 3 2026-06-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL1074 PHL → CLT Jul 26, 22:45 UTCJul 26, 23:00 UTC15m
2026-07-26 AAL3265 BDL → DFW Jul 26, 18:50 UTCJul 26, 21:15 UTC2h 25m
2026-07-26 AAL3057 PHX → CLT Jul 26, 13:05 UTCJul 26, 16:45 UTC3h 40m
2026-07-26 AAL3057 PHX → CLT Jul 26, 13:05 UTCJul 26, 16:40 UTC3h 35m
2026-07-26 AAL3133 UVF → PHL Jul 26, 05:10 UTCJul 26, 08:00 UTC2h 51m
2026-07-26 AAL3133 UVF → PHL Jul 26, 05:05 UTCJul 26, 07:57 UTC2h 52m
2026-07-26 AAL2247 BOS → MIA Jul 26, 00:20 UTCJul 26, 03:15 UTC2h 55m
2026-07-25 AAL2906 PVD → DCA Jul 25, 19:50 UTCJul 25, 20:30 UTC40m
2026-07-25 AAL2906 PVD → DCA Jul 25, 17:55 UTCJul 25, 18:15 UTC20m
2026-07-25 AAL2906 PVD → DCA Jul 25, 17:10 UTCJul 25, 17:20 UTC10m
2026-07-25 AAL2906 PVD → DCA Jul 25, 17:06 UTCJul 25, 20:07 UTC3h 1m
2026-07-25 AAL2906 PVD → DCA Jul 25, 12:30 UTCJul 25, 14:40 UTC2h 10m
2026-07-25 AAL1088 DFW → LGA Jul 25, 09:20 UTCJul 25, 10:55 UTC1h 35m
2026-07-25 AAL494 CLT → RDU Jul 25, 03:55 UTCJul 25, 04:20 UTC25m
2026-07-25 AAL689 CLT → ORD Jul 25, 00:10 UTCJul 25, 01:35 UTC1h 25m
2026-07-24 AAL2247 BOS → MIA Jul 24, 19:45 UTCJul 24, 22:25 UTC2h 40m
2026-07-24 AAL1474 PWM → DCA Jul 24, 15:30 UTCJul 24, 18:05 UTC2h 35m
2026-07-24 AAL392 PHL → PVD Jul 24, 11:35 UTCJul 24, 13:45 UTC2h 10m
2026-07-24 AAL392 PHL → PVD Jul 24, 11:31 UTCJul 24, 13:29 UTC1h 58m
2026-07-24 AAL1724 DFW → BUF Jul 24, 00:05 UTCJul 24, 01:45 UTC1h 40m
2026-07-23 AAL2066 DFW → SLC Jul 23, 19:35 UTCJul 23, 22:00 UTC2h 25m
2026-07-23 AAL2066 DFW → SLC Jul 23, 19:33 UTCJul 23, 22:00 UTC2h 27m
2026-07-23 AAL2066 DFW → SLC Jul 23, 16:15 UTCJul 23, 18:15 UTC2h 0m
2026-07-23 AAL1327 JFK → CUN Jul 23, 12:15 UTCJul 23, 14:55 UTC2h 40m
2026-07-23 AAL1327 JFK → CUN Jul 23, 12:15 UTCJul 23, 14:57 UTC2h 42m
2026-07-23 AAL1134 PEI → MIA Jul 23, 01:20 UTCJul 23, 05:40 UTC4h 20m
2026-07-23 AAL1134 PEI → MIA Jul 23, 01:18 UTCJul 23, 05:36 UTC4h 18m
2026-07-22 AAL914 CTG → MIA Jul 22, 20:21 UTCJul 22, 22:44 UTC2h 23m
2026-07-22 AAL914 CTG → MIA Jul 22, 20:25 UTCJul 22, 22:45 UTC2h 20m
2026-07-22 AAL2173 MIA → CTG Jul 22, 16:30 UTCJul 22, 16:55 UTC25m
2026-07-22 AAL2173 MIA → CTG Jul 22, 16:29 UTCJul 22, 18:54 UTC2h 25m
2026-07-22 AAL1498 - Jul 22, 12:00 UTCJul 22, 14:45 UTC2h 45m
2026-07-21 AAL257 MIA → MEX Jul 21, 22:55 UTCJul 22, 01:30 UTC2h 35m
2026-07-21 AAL1508 RDU → LGA Jul 21, 18:40 UTCJul 21, 20:45 UTC2h 5m
2026-07-21 AAL495 JFK → CLT Jul 21, 14:45 UTCJul 21, 16:45 UTC2h 0m
2026-07-21 AAL386 - Jul 21, 11:25 UTCJul 21, 13:10 UTC1h 45m
2026-07-21 AAL2552 - Jul 21, 04:40 UTCJul 21, 06:15 UTC1h 35m
2026-07-21 AAL2552 MIA → MSY Jul 21, 04:35 UTCJul 21, 06:14 UTC1h 39m
2026-07-20 AAL3244 MIA → LAS Jul 20, 23:37 UTCJul 21, 01:59 UTC2h 22m
2026-07-20 AAL3244 MIA → LAS Jul 20, 23:40 UTCJul 21, 02:00 UTC2h 20m
2026-07-20 AAL2769 - Jul 20, 20:40 UTCJul 20, 22:05 UTC1h 25m
2026-07-20 AAL2769 ORD → DCA Jul 20, 20:36 UTCJul 20, 22:06 UTC1h 30m
2026-07-20 AAL359 - Jul 20, 15:10 UTCJul 20, 19:15 UTC4h 5m
2026-07-20 AAL1620 PHX → CVG Jul 20, 00:30 UTCJul 20, 04:20 UTC3h 50m
2026-07-19 AAL1910 PDX → PHL Jul 19, 18:35 UTCJul 19, 22:15 UTC3h 40m
2026-07-19 AAL1503 CUN → ORD Jul 19, 13:40 UTCJul 19, 16:40 UTC3h 0m
2026-07-19 AAL1503 CUN → ORD Jul 19, 13:39 UTCJul 19, 16:39 UTC3h 0m
2026-07-19 AAL2819 JFK → ORD Jul 19, 03:55 UTCJul 19, 05:10 UTC1h 15m
2026-07-19 AAL2819 JFK → ORD Jul 19, 02:30 UTCJul 19, 05:10 UTC2h 40m
2026-07-19 AAL2819 JFK → ORD Jul 19, 02:29 UTCJul 19, 03:38 UTC1h 9m

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 N891NN page for operator, model, and routing details .

Mode-S AC4A44 frequently asked

What is Mode-S code AC4A44?
AC4A44 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N891NN.
Where is Mode-S AC4A44 registered?
Mode-S code AC4A44 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 AC4A44 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 23:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC4A44, octal 53045104, decimal 11,291,204.
What flights does AC4A44 operate?
Mode-S AC4A44 has broadcast 20 distinct callsigns, including AAL1927, AAL3238, AAL2906, AAL2066, AAL1680.