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sensors Mode-S transponder

A71AA5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N557NN · BOMBARDIER Regional Jet CRJ-900 · operated by AMERICAN AIRLINES INC

Hex
A71AA5
Octal
51615245
Decimal
10,951,333
Country
US
Tail
N557NN
Type
CRJ9
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
694
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A71AA5.

Country allocation

The ICAO 24-bit address A71AA5 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
JIA5490 PSA Airlines 10 2026-05-24
JIA5179 PSA Airlines 10 2026-07-25
JIA5405 PSA Airlines 9 2026-07-23
JIA5350 - 9 2026-06-30
JIA5644 - 8 2026-07-15
JIA5266 - 8 2026-07-21
JIA5670 PSA Airlines 7 2026-04-15
JIA5593 PSA Airlines 7 2026-05-30
JIA5509 - 7 2026-07-02
JIA5443 - 7 2026-06-27
JIA5286 - 7 2026-07-10
JIA5150 - 7 2026-07-01
JIA5658 - 6 2026-07-02
JIA5595 - 6 2026-07-13
JIA5579 PSA Airlines 6 2026-05-28
JIA5483 - 6 2026-07-21
JIA5294 PSA Airlines 6 2026-07-26
JIA5265 PSA Airlines 6 2026-07-25
JIA5248 PSA Airlines 6 2026-06-16
JIA5137 PSA Airlines 6 2026-06-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JIA5298 DTW → PHL Jul 26, 19:50 UTCJul 26, 21:05 UTC1h 15m
2026-07-26 JIA5294 IND → PHL Jul 26, 16:20 UTCJul 26, 18:15 UTC1h 55m
2026-07-26 JIA5294 IND → PHL Jul 26, 13:25 UTCJul 26, 15:05 UTC1h 40m
2026-07-26 JIA5495 CAK → CLT Jul 26, 10:11 UTCJul 26, 11:14 UTC1h 3m
2026-07-26 JIA5495 CAK → CLT Jul 26, 10:15 UTCJul 26, 11:10 UTC55m
2026-07-25 JIA5099 AGS → PHL Jul 25, 23:20 UTCJul 26, 00:20 UTC1h 0m
2026-07-25 JIA5099 AGS → PHL Jul 25, 23:15 UTCJul 26, 00:14 UTC59m
2026-07-25 JIA5265 DFW → SBN Jul 25, 20:35 UTCJul 25, 21:25 UTC50m
2026-07-25 JIA5265 DFW → SBN Jul 25, 18:50 UTCJul 25, 19:40 UTC50m
2026-07-25 JIA5179 PHL → RDU Jul 25, 16:10 UTCJul 25, 17:15 UTC1h 5m
2026-07-25 JIA5179 PHL → RDU Jul 25, 14:00 UTCJul 25, 15:10 UTC1h 10m
2026-07-25 JIA5054 DCA → BDL Jul 25, 09:20 UTCJul 25, 10:20 UTC1h 0m
2026-07-25 JIA5549 DCA → PHL Jul 25, 01:05 UTCJul 25, 02:00 UTC55m
2026-07-24 JIA5021 DCA → MHT Jul 24, 21:05 UTCJul 24, 22:45 UTC1h 40m
2026-07-24 JIA5021 DCA → MHT Jul 24, 18:30 UTCJul 24, 20:25 UTC1h 55m
2026-07-24 JIA5462 DCA → MCI Jul 24, 15:30 UTCJul 24, 16:40 UTC1h 10m
2026-07-24 JIA5462 DCA → MCI Jul 24, 15:27 UTCJul 24, 16:37 UTC1h 10m
2026-07-24 JIA5462 DCA → MCI Jul 24, 13:30 UTCJul 24, 14:30 UTC1h 0m
2026-07-24 JIA5054 DCA → BDL Jul 24, 09:20 UTCJul 24, 10:20 UTC1h 0m
2026-07-24 JIA5549 DCA → PHL Jul 24, 01:45 UTCJul 24, 02:35 UTC50m
2026-07-23 JIA5117 - Jul 23, 22:30 UTCJul 23, 23:30 UTC1h 0m
2026-07-23 JIA5117 - Jul 23, 20:35 UTCJul 23, 21:35 UTC1h 0m
2026-07-23 JIA5405 PHL → MSY Jul 23, 19:00 UTCJul 23, 19:10 UTC10m
2026-07-23 JIA5405 PHL → MSY Jul 23, 17:28 UTCJul 23, 18:42 UTC1h 14m
2026-07-23 JIA5405 PHL → MSY Jul 23, 14:50 UTCJul 23, 16:35 UTC1h 45m
2026-07-23 JIA5234 DAY → CLT Jul 23, 11:30 UTCJul 23, 12:40 UTC1h 10m
2026-07-22 JIA5129 CVG → CLT Jul 22, 23:30 UTCJul 23, 00:40 UTC1h 10m
2026-07-22 JIA5129 CVG → CLT Jul 22, 21:25 UTCJul 22, 22:20 UTC55m
2026-07-22 JIA5129 CVG → CLT Jul 22, 19:25 UTCJul 22, 20:30 UTC1h 5m
2026-07-22 JIA5430 - Jul 22, 16:20 UTCJul 22, 17:40 UTC1h 20m
2026-07-22 JIA5433 - Jul 22, 13:50 UTCJul 22, 15:20 UTC1h 30m
2026-07-21 JIA5389 BNA → PHL Jul 21, 23:50 UTCJul 22, 01:00 UTC1h 10m
2026-07-21 JIA5389 BNA → PHL Jul 21, 23:44 UTCJul 22, 00:58 UTC1h 14m
2026-07-21 JIA5389 BNA → PHL Jul 21, 21:20 UTCJul 21, 23:00 UTC1h 40m
2026-07-21 JIA9966 - Jul 21, 18:20 UTCJul 21, 19:35 UTC1h 15m
2026-07-21 JIA5483 - Jul 21, 11:15 UTCJul 21, 13:20 UTC2h 5m
2026-07-21 JIA5483 - Jul 21, 03:40 UTCJul 21, 05:30 UTC1h 50m
2026-07-21 JIA5483 PHL → MKE Jul 21, 03:44 UTCJul 21, 05:24 UTC1h 40m
2026-07-21 JIA5483 - Jul 21, 03:25 UTCJul 21, 03:30 UTC5m
2026-07-21 JIA5266 - Jul 21, 00:35 UTCJul 21, 02:30 UTC1h 55m
2026-07-20 JIA5266 PHL → MEM Jul 20, 21:40 UTCJul 20, 23:35 UTC1h 55m
2026-07-20 JIA5239 - Jul 20, 19:20 UTCJul 20, 20:10 UTC50m
2026-07-20 JIA5239 PIT → PHL Jul 20, 19:16 UTCJul 20, 20:08 UTC52m
2026-07-20 JIA5485 - Jul 20, 17:30 UTCJul 20, 18:15 UTC45m
2026-07-20 JIA5485 PHL → PIT Jul 20, 17:29 UTCJul 20, 18:13 UTC44m
2026-07-20 JIA5485 - Jul 20, 17:05 UTCJul 20, 17:10 UTC5m
2026-07-20 JIA5576 BNA → PHL Jul 20, 14:15 UTCJul 20, 15:50 UTC1h 35m
2026-07-20 JIA5576 - Jul 20, 11:45 UTCJul 20, 13:20 UTC1h 35m
2026-07-20 JIA5576 - Jul 20, 11:30 UTCJul 20, 11:35 UTC5m
2026-07-20 JIA5487 DFW → CAE Jul 20, 09:45 UTCJul 20, 10:30 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 N557NN page for operator, model, and routing details .

Mode-S A71AA5 frequently asked

What is Mode-S code A71AA5?
A71AA5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N557NN.
Where is Mode-S A71AA5 registered?
Mode-S code A71AA5 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 A71AA5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:05 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A71AA5, octal 51615245, decimal 10,951,333.
What flights does A71AA5 operate?
Mode-S A71AA5 has broadcast 20 distinct callsigns, including JIA5490, JIA5179, JIA5405, JIA5350, JIA5644.