Apparatus

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sensors Mode-S transponder

A5A878

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N464AA · AIRBUS A-321neo · operated by AMERICAN AIRLINES INC

Hex
A5A878
Octal
51324170
Decimal
10,856,568
Country
US
Tail
N464AA
Type
A21N
No current signal · last broadcast Jul 26, 20:40 UTC
Flights observed
422
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:40 UTC

Last known position

Most recent position reported by Mode-S A5A878.

Country allocation

The ICAO 24-bit address A5A878 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
AAL645 - 12 2026-06-29
AAL1719 American Airlines 10 2026-07-25
AAL271 - 9 2026-07-13
AAL435 - 7 2026-06-26
AAL873 American Airlines 6 2026-05-07
AAL315 American Airlines 6 2026-06-06
AAL3005 American Airlines 6 2026-07-24
AAL2031 - 6 2026-07-12
AAL1454 American Airlines 6 2026-04-17
AAL779 - 5 2026-07-23
AAL769 - 5 2026-06-26
AAL432 American Airlines 5 2026-06-27
AAL3288 American Airlines 5 2026-05-28
AAL2669 American Airlines 5 2026-05-26
AAL2499 - 5 2026-07-12
AAL2300 American Airlines 5 2026-07-26
AAL143 American Airlines 5 2026-05-28
AAL918 American Airlines 4 2026-06-10
AAL848 American Airlines 4 2026-07-26
AAL694 American Airlines 4 2026-05-23

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL2300 PHX → PHL Jul 26, 16:30 UTCJul 26, 20:40 UTC4h 10m
2026-07-26 AAL848 STI → PHL Jul 26, 13:25 UTCJul 26, 14:50 UTC1h 25m
2026-07-26 AAL205 BOS → MIA Jul 26, 03:00 UTCJul 26, 04:00 UTC1h 0m
2026-07-25 AAL1719 LAX → YVR Jul 25, 22:10 UTCJul 26, 00:50 UTC2h 40m
2026-07-25 AAL1719 LAX → YVR Jul 25, 22:04 UTCJul 26, 00:46 UTC2h 42m
2026-07-25 AAL1719 LAX → YVR Jul 25, 18:40 UTCJul 25, 20:50 UTC2h 10m
2026-07-25 AAL3204 DFW → LCH Jul 25, 03:55 UTCJul 25, 04:50 UTC55m
2026-07-25 AAL2032 PHL → RSW Jul 25, 01:15 UTCJul 25, 02:15 UTC1h 0m
2026-07-24 AAL1719 LAX → YVR Jul 24, 21:15 UTCJul 24, 23:50 UTC2h 35m
2026-07-24 AAL1719 LAX → YVR Jul 24, 17:15 UTCJul 24, 19:30 UTC2h 15m
2026-07-24 AAL2005 MCI → PHX Jul 24, 12:35 UTCJul 24, 15:05 UTC2h 30m
2026-07-24 AAL3099 MSP → CLT Jul 24, 08:55 UTCJul 24, 11:10 UTC2h 15m
2026-07-24 AAL3099 MSP → CLT Jul 24, 08:51 UTCJul 24, 11:07 UTC2h 16m
2026-07-24 AAL3005 PHL → LAS Jul 24, 02:55 UTCJul 24, 06:00 UTC3h 5m
2026-07-24 AAL3005 PHL → LAS Jul 24, 02:53 UTCJul 24, 07:24 UTC4h 31m
2026-07-23 AAL779 LAS → PHL Jul 23, 15:55 UTCJul 23, 20:00 UTC4h 5m
2026-07-23 AAL779 LAS → PHL Jul 23, 15:54 UTCJul 23, 20:00 UTC4h 6m
2026-07-23 AAL1969 SRQ → ORD Jul 23, 12:15 UTCJul 23, 14:25 UTC2h 10m
2026-07-23 AAL3099 MSP → CLT Jul 23, 08:05 UTCJul 23, 10:15 UTC2h 10m
2026-07-23 AAL3099 MSP → CLT Jul 23, 08:00 UTCJul 23, 10:10 UTC2h 10m
2026-07-22 AAL3005 PHL → LAS Jul 22, 22:50 UTCJul 23, 03:35 UTC4h 45m
2026-07-22 AAL2941 - Jul 22, 15:45 UTCJul 22, 20:30 UTC4h 45m
2026-07-22 AAL2941 SFO → PHL Jul 22, 15:41 UTCJul 22, 20:26 UTC4h 45m
2026-07-22 AAL3166 STL → PHX Jul 22, 03:05 UTCJul 22, 08:23 UTC5h 18m
2026-07-22 AAL3166 STL → PHX Jul 22, 03:10 UTCJul 22, 05:25 UTC2h 15m
2026-07-21 AAL2300 - Jul 21, 17:05 UTCJul 21, 22:10 UTC5h 5m
2026-07-21 AAL848 STI → PHL Jul 21, 09:31 UTCJul 21, 14:45 UTC5h 14m
2026-07-21 AAL848 STI → PHL Jul 21, 02:15 UTCJul 21, 14:50 UTC12h 35m
2026-07-20 AAL1719 LAX → YVR Jul 20, 21:40 UTCJul 21, 00:00 UTC2h 19m
2026-07-20 AAL1719 LAX → YVR Jul 20, 21:35 UTCJul 21, 00:01 UTC2h 26m
2026-07-20 AAL1719 LAX → YVR Jul 20, 18:05 UTCJul 20, 20:15 UTC2h 10m
2026-07-20 AAL2888 - Jul 20, 14:35 UTCJul 20, 15:55 UTC1h 20m
2026-07-20 AAL2888 - Jul 20, 10:55 UTCJul 20, 11:15 UTC20m
2026-07-20 AAL1313 PHL → DEN Jul 20, 03:25 UTCJul 20, 09:05 UTC5h 40m
2026-07-20 AAL1313 PHL → DEN Jul 20, 03:23 UTCJul 20, 09:03 UTC5h 40m
2026-07-19 AAL1499 SDF → CLT Jul 19, 21:20 UTCJul 20, 01:45 UTC4h 25m
2026-07-19 AAL1499 SDF → CLT Jul 19, 21:17 UTCJul 20, 01:45 UTC4h 28m
2026-07-19 AAL1665 - Jul 19, 15:15 UTCJul 19, 19:15 UTC4h 0m
2026-07-18 AAL596 - Jul 18, 23:15 UTCJul 19, 03:00 UTC3h 45m
2026-07-18 AAL1678 - Jul 18, 17:30 UTCJul 18, 21:05 UTC3h 35m
2026-07-18 AAL1678 - Jul 18, 12:20 UTCJul 18, 15:55 UTC3h 35m
2026-07-17 AAL1988 - Jul 17, 22:35 UTCJul 18, 03:00 UTC4h 26m
2026-07-17 AAL2408 NAS → LGA Jul 17, 16:34 UTCJul 17, 21:20 UTC4h 45m
2026-07-17 AAL3225 BOS → PHL Jul 17, 14:30 UTCJul 17, 15:20 UTC50m
2026-07-17 AAL3225 PHL → BOS Jul 17, 11:39 UTCJul 17, 12:25 UTC45m
2026-07-17 AAL1121 - Jul 17, 06:05 UTCJul 17, 10:25 UTC4h 20m
2026-07-16 AAL596 - Jul 16, 22:59 UTCJul 17, 02:50 UTC3h 50m
2026-07-16 AAL1678 - Jul 16, 17:49 UTCJul 16, 21:35 UTC3h 45m
2026-07-16 AAL1678 - Jul 16, 12:30 UTCJul 16, 16:05 UTC3h 35m
2026-07-16 AAL349 - Jul 16, 09:15 UTCJul 16, 10:00 UTC45m

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 N464AA page for operator, model, and routing details .

Mode-S A5A878 frequently asked

What is Mode-S code A5A878?
A5A878 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N464AA.
Where is Mode-S A5A878 registered?
Mode-S code A5A878 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 A5A878 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A5A878, octal 51324170, decimal 10,856,568.
What flights does A5A878 operate?
Mode-S A5A878 has broadcast 20 distinct callsigns, including AAL645, AAL1719, AAL271, AAL435, AAL873.