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sensors Mode-S transponder

A7A257

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N591NN · BOMBARDIER Regional Jet CRJ-900 · operated by AMERICAN AIRLINES INC

Hex
A7A257
Octal
51721127
Decimal
10,986,071
Country
US
Tail
N591NN
Type
CRJ9
No current signal · last broadcast Jul 26, 21:05 UTC
Flights observed
629
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:05 UTC

Last known position

Most recent position reported by Mode-S A7A257.

Country allocation

The ICAO 24-bit address A7A257 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
JIA5616 PSA Airlines 10 2026-06-09
JIA5324 PSA Airlines 10 2026-05-20
JIA5475 PSA Airlines 9 2026-07-21
JIA5196 - 7 2026-06-25
JIA5581 - 6 2026-07-07
JIA5480 PSA Airlines 6 2026-05-26
JIA5416 - 6 2026-07-10
JIA5405 - 6 2026-07-02
JIA5377 - 6 2026-07-19
JIA5186 PSA Airlines 6 2026-07-24
JIA5123 PSA Airlines 6 2026-06-19
JIA5650 - 5 2026-06-23
JIA5638 PSA Airlines 5 2026-04-30
JIA5443 PSA Airlines 5 2026-05-27
JIA5387 PSA Airlines 5 2026-06-12
JIA5380 PSA Airlines 5 2026-06-10
JIA5249 - 5 2026-07-14
JIA5173 PSA Airlines 5 2026-07-20
JIA5148 PSA Airlines 5 2026-06-22
JIA5144 - 5 2026-06-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 JIA5248 DCA → PHL Jul 26, 19:35 UTCJul 26, 21:05 UTC1h 30m
2026-07-26 JIA516W DSM → PHL Jul 26, 16:50 UTCJul 26, 17:45 UTC55m
2026-07-25 JIA5166 JAX → PHL Jul 25, 13:20 UTCJul 25, 14:05 UTC45m
2026-07-25 JIA5620 TYS → PHL Jul 25, 10:10 UTCJul 25, 11:30 UTC1h 20m
2026-07-24 JIA5453 CLT → PNS Jul 24, 23:50 UTCJul 25, 01:30 UTC1h 40m
2026-07-24 JIA5026 ALB → PHL Jul 24, 20:30 UTCJul 24, 22:35 UTC2h 5m
2026-07-24 JIA5026 ALB → PHL Jul 24, 17:35 UTCJul 24, 19:30 UTC1h 55m
2026-07-24 JIA5071 PHL → ORF Jul 24, 15:25 UTCJul 24, 16:15 UTC50m
2026-07-24 JIA5071 PHL → ORF Jul 24, 13:45 UTCJul 24, 14:30 UTC45m
2026-07-24 JIA5195 PHL → PWM Jul 24, 10:10 UTCJul 24, 11:25 UTC1h 15m
2026-07-24 JIA5186 DCA → BTV Jul 24, 04:40 UTCJul 24, 05:45 UTC1h 5m
2026-07-24 JIA5651 GSP → PHL Jul 24, 02:05 UTCJul 24, 03:40 UTC1h 35m
2026-07-24 JIA5651 GSP → PHL Jul 24, 02:03 UTCJul 24, 03:40 UTC1h 37m
2026-07-23 JIA5649 MSY → DCA Jul 23, 23:50 UTCJul 24, 01:00 UTC1h 10m
2026-07-23 JIA5093 DCA → MHT Jul 23, 19:35 UTCJul 23, 22:10 UTC2h 35m
2026-07-23 JIA5093 DCA → MHT Jul 23, 16:55 UTCJul 23, 18:40 UTC1h 45m
2026-07-23 JIA5654 BGR → CLT Jul 23, 13:25 UTCJul 23, 13:45 UTC20m
2026-07-23 JIA5654 BGR → CLT Jul 23, 13:19 UTCJul 23, 13:43 UTC24m
2026-07-23 JIA5524 MSP → DCA Jul 23, 01:10 UTCJul 23, 01:20 UTC10m
2026-07-23 JIA5524 MSP → DCA Jul 23, 01:07 UTCJul 23, 01:28 UTC21m
2026-07-22 JIA5343 DCA → MSP Jul 22, 21:25 UTCJul 22, 22:45 UTC1h 20m
2026-07-22 JIA5500 LIT → CLT Jul 22, 19:05 UTCJul 22, 20:35 UTC1h 30m
2026-07-22 JIA5535 - Jul 22, 16:20 UTCJul 22, 17:10 UTC50m
2026-07-22 JIA5535 - Jul 22, 14:25 UTCJul 22, 15:20 UTC55m
2026-07-22 JIA5195 PHL → PWM Jul 22, 11:10 UTCJul 22, 11:15 UTC5m
2026-07-22 JIA5186 DCA → BTV Jul 22, 03:45 UTCJul 22, 05:20 UTC1h 35m
2026-07-21 JIA5156 DFW → DAY Jul 21, 23:20 UTCJul 22, 01:35 UTC2h 15m
2026-07-21 JIA5156 DFW → DAY Jul 21, 20:15 UTCJul 21, 22:15 UTC2h 0m
2026-07-21 JIA5593 MSP → DCA Jul 21, 15:55 UTCJul 21, 17:35 UTC1h 40m
2026-07-21 JIA5593 MSP → DCA Jul 21, 13:05 UTCJul 21, 14:50 UTC1h 45m
2026-07-21 JIA5195 PHL → PWM Jul 21, 10:15 UTCJul 21, 11:30 UTC1h 15m
2026-07-21 JIA5186 - Jul 21, 03:35 UTCJul 21, 04:40 UTC1h 5m
2026-07-21 JIA5186 DFW → MOB Jul 21, 03:31 UTCJul 21, 04:46 UTC1h 15m
2026-07-21 JIA5475 BGR → DCA Jul 21, 00:55 UTCJul 21, 02:25 UTC1h 30m
2026-07-21 JIA5475 BGR → DCA Jul 21, 00:51 UTCJul 21, 02:19 UTC1h 28m
2026-07-20 JIA5580 BNA → PHL Jul 20, 22:15 UTCJul 20, 23:55 UTC1h 39m
2026-07-20 JIA5173 PHL → PVD Jul 20, 18:25 UTCJul 20, 20:30 UTC2h 5m
2026-07-20 JIA5173 PHL → PVD Jul 20, 15:20 UTCJul 20, 17:15 UTC1h 55m
2026-07-20 JIA5173 PHL → PVD Jul 20, 14:55 UTCJul 20, 15:00 UTC5m
2026-07-20 JIA5570 SAV → PHL Jul 20, 11:55 UTCJul 20, 13:25 UTC1h 30m
2026-07-20 JIA5382 DCA → BGR Jul 20, 00:20 UTCJul 20, 01:00 UTC40m
2026-07-19 JIA5265 DFW → SBN Jul 19, 21:50 UTCJul 19, 22:45 UTC55m
2026-07-19 JIA5265 DFW → SBN Jul 19, 19:40 UTCJul 19, 20:50 UTC1h 10m
2026-07-19 JIA5377 - Jul 19, 16:10 UTCJul 19, 17:55 UTC1h 45m
2026-07-19 JIA5377 ROC → CLT Jul 19, 16:10 UTCJul 19, 17:54 UTC1h 44m
2026-07-19 JIA5377 - Jul 19, 13:55 UTCJul 19, 15:15 UTC1h 20m
2026-07-19 JIA5540 - Jul 19, 10:25 UTCJul 19, 11:40 UTC1h 15m
2026-07-19 JIA5464 - Jul 19, 03:05 UTCJul 19, 04:15 UTC1h 10m
2026-07-19 JIA5464 CLT → AVP Jul 19, 03:01 UTCJul 19, 04:19 UTC1h 18m
2026-07-18 JIA5439 - Jul 18, 23:40 UTCJul 19, 00:40 UTC1h 0m

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 N591NN page for operator, model, and routing details .

Mode-S A7A257 frequently asked

What is Mode-S code A7A257?
A7A257 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N591NN.
Where is Mode-S A7A257 registered?
Mode-S code A7A257 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 A7A257 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 A7A257, octal 51721127, decimal 10,986,071.
What flights does A7A257 operate?
Mode-S A7A257 has broadcast 20 distinct callsigns, including JIA5616, JIA5324, JIA5475, JIA5196, JIA5581.