Apparatus

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sensors Mode-S transponder

AA1A81

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N750EV · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
AA1A81
Octal
52415201
Decimal
11,147,905
Country
US
Tail
N750EV
Type
CRJ7
No current signal · last broadcast Jul 26, 21:45 UTC
Flights observed
752
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:45 UTC

Last known position

Most recent position reported by Mode-S AA1A81.

Country allocation

The ICAO 24-bit address AA1A81 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
SKW6348 - 15 2026-06-25
SKW5012 - 12 2026-06-27
SKW6387 - 11 2026-06-25
SKW6324 - 11 2026-06-26
SKW6436 - 10 2026-07-06
SKW6372 SkyWest Airlines 10 2026-06-13
SKW6250 SkyWest Airlines 10 2026-07-26
SKW6446 - 9 2026-07-08
SKW6385 - 9 2026-07-06
SKW6376 - 9 2026-06-24
SKW6363 SkyWest Airlines 9 2026-05-29
SKW6236 SkyWest Airlines 9 2026-05-28
SKW4966 SkyWest Airlines 9 2026-07-17
SKW6459 - 8 2026-07-20
SKW6364 SkyWest Airlines 8 2026-05-03
SKW5011 - 8 2026-06-19
SKW4918 - 8 2026-07-09
SKW296Y - 8 2026-06-27
SKW6439 SkyWest Airlines 7 2026-05-21
SKW6373 SkyWest Airlines 7 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW6245 ORD → DTW Jul 26, 20:55 UTCJul 26, 21:45 UTC50m
2026-07-26 SKW4954 GJT → PHX Jul 26, 18:50 UTCJul 26, 19:40 UTC50m
2026-07-26 SKW4954 GJT → PHX Jul 26, 16:55 UTCJul 26, 17:40 UTC45m
2026-07-26 SKW6250 PHX → SLC Jul 26, 14:23 UTCJul 26, 15:35 UTC1h 12m
2026-07-26 SKW6250 PHX → SLC Jul 26, 12:20 UTCJul 26, 13:20 UTC1h 0m
2026-07-26 SKW6274 DFW → FSD Jul 26, 07:25 UTCJul 26, 09:00 UTC1h 35m
2026-07-26 SKW6274 DFW → FSD Jul 26, 05:00 UTCJul 26, 06:35 UTC1h 36m
2026-07-25 SKW5003 BRO → DFW Jul 25, 23:45 UTCJul 26, 01:25 UTC1h 40m
2026-07-25 SKW5003 BRO → DFW Jul 25, 14:30 UTCJul 25, 16:05 UTC1h 35m
2026-07-25 SKW6464 HSV → ORD Jul 25, 10:20 UTCJul 25, 11:40 UTC1h 20m
2026-07-25 SKW6426 PHX → SBA Jul 25, 03:55 UTCJul 25, 05:05 UTC1h 10m
2026-07-25 SKW6433 PHX → BFL Jul 25, 00:05 UTCJul 25, 01:50 UTC1h 45m
2026-07-25 SKW6433 PHX → BFL Jul 25, 00:06 UTCJul 25, 01:31 UTC1h 25m
2026-07-24 SKW6433 PHX → BFL Jul 24, 21:50 UTCJul 24, 23:20 UTC1h 30m
2026-07-24 SKW6379 ORD → OKC Jul 24, 19:10 UTCJul 24, 19:50 UTC40m
2026-07-24 SKW6379 ORD → OKC Jul 24, 19:05 UTCJul 24, 19:35 UTC30m
2026-07-24 SKW6379 ORD → OKC Jul 24, 17:25 UTCJul 24, 17:55 UTC30m
2026-07-24 SKW6232 SMF → PHX Jul 24, 15:20 UTCJul 24, 15:50 UTC30m
2026-07-24 SKW6232 SMF → PHX Jul 24, 15:18 UTCJul 24, 15:44 UTC26m
2026-07-24 SKW6232 SMF → PHX Jul 24, 14:00 UTCJul 24, 14:25 UTC25m
2026-07-24 SKW6465 DTW → ORD Jul 24, 10:55 UTCJul 24, 11:38 UTC43m
2026-07-24 SKW4931 LAX → PHX Jul 24, 00:30 UTCJul 24, 01:15 UTC45m
2026-07-23 SKW4833 LWB → ORD Jul 23, 20:30 UTCJul 23, 21:50 UTC1h 20m
2026-07-23 SKW483O ISN → MSP Jul 23, 18:50 UTCJul 23, 19:15 UTC25m
2026-07-23 SKW6228 MRY → PHX Jul 23, 14:45 UTCJul 23, 16:10 UTC1h 25m
2026-07-23 SKW6228 MRY → PHX Jul 23, 14:33 UTCJul 23, 16:11 UTC1h 38m
2026-07-23 SKW6228 MRY → PHX Jul 23, 11:55 UTCJul 23, 13:30 UTC1h 35m
2026-07-23 SKW4827 SHD → CLT Jul 23, 09:20 UTCJul 23, 10:10 UTC50m
2026-07-23 SKW4827 SHD → CLT Jul 23, 08:58 UTCJul 23, 09:54 UTC56m
2026-07-22 SKW4832 ORD → SHD Jul 22, 23:20 UTCJul 23, 00:25 UTC1h 5m
2026-07-22 SKW4950 PHX → SFO Jul 22, 19:55 UTCJul 22, 20:55 UTC1h 0m
2026-07-22 SKW4950 PHX → SFO Jul 22, 19:52 UTCJul 22, 20:52 UTC1h 0m
2026-07-22 SKW4950 PHX → SFO Jul 22, 18:05 UTCJul 22, 18:50 UTC45m
2026-07-22 SKW6244 ORD → FSD Jul 22, 15:30 UTCJul 22, 16:40 UTC1h 10m
2026-07-22 SKW6244 ORD → FSD Jul 22, 13:35 UTCJul 22, 14:20 UTC45m
2026-07-22 SKW6338 PHX → TUL Jul 22, 11:10 UTCJul 22, 11:50 UTC40m
2026-07-22 SKW6396 BNA → ORD Jul 22, 04:50 UTCJul 22, 05:25 UTC35m
2026-07-22 SKW6396 BNA → ORD Jul 22, 04:47 UTCJul 22, 05:36 UTC49m
2026-07-22 SKW6274 DFW → FSD Jul 22, 01:19 UTCJul 22, 02:52 UTC1h 33m
2026-07-22 SKW6274 DFW → FSD Jul 22, 01:20 UTCJul 22, 02:55 UTC1h 35m
2026-07-21 SKW6274 DFW → FSD Jul 21, 22:30 UTCJul 22, 00:10 UTC1h 40m
2026-07-21 SKW6519 PHX → SJC Jul 21, 19:00 UTCJul 21, 20:40 UTC1h 40m
2026-07-21 SKW6519 PHX → SJC Jul 21, 18:57 UTCJul 21, 20:22 UTC1h 25m
2026-07-21 SKW6277 - Jul 21, 16:15 UTCJul 21, 18:10 UTC1h 55m
2026-07-21 SKW6277 PHX → OKC Jul 21, 16:01 UTCJul 21, 18:03 UTC2h 2m
2026-07-21 SKW6505 MRY → PHX Jul 21, 14:05 UTCJul 21, 14:30 UTC25m
2026-07-21 SKW6505 MRY → PHX Jul 21, 13:53 UTCJul 21, 14:26 UTC33m
2026-07-21 SKW6509 PHX → YUM Jul 21, 02:40 UTCJul 21, 03:09 UTC29m
2026-07-21 SKW6509 - Jul 21, 02:45 UTCJul 21, 03:05 UTC20m
2026-07-20 SKW6459 - Jul 20, 23:30 UTCJul 21, 01:15 UTC1h 44m

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 N750EV page for operator, model, and routing details .

Mode-S AA1A81 frequently asked

What is Mode-S code AA1A81?
AA1A81 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N750EV.
Where is Mode-S AA1A81 registered?
Mode-S code AA1A81 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 AA1A81 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA1A81, octal 52415201, decimal 11,147,905.
What flights does AA1A81 operate?
Mode-S AA1A81 has broadcast 20 distinct callsigns, including SKW6348, SKW5012, SKW6387, SKW6324, SKW6436.