Apparatus

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sensors Mode-S transponder

A9A404

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N720EV · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9A404
Octal
52322004
Decimal
11,117,572
Country
US
Tail
N720EV
Type
CRJ7
No current signal · last broadcast 2h ago
Flights observed
679
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A9A404.

Country allocation

The ICAO 24-bit address A9A404 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
SKW6311 SkyWest Airlines 13 2026-05-28
SKW6365 SkyWest Airlines 11 2026-05-03
SKW6321 SkyWest Airlines 11 2026-04-30
SKW6428 SkyWest Airlines 10 2026-05-04
SKW4949 - 10 2026-07-01
SKW6426 SkyWest Airlines 9 2026-06-02
SKW6429 SkyWest Airlines 8 2026-05-13
SKW6386 SkyWest Airlines 8 2026-06-11
SKW6357 SkyWest Airlines 8 2026-05-14
SKW6363 - 7 2026-07-02
SKW6317 SkyWest Airlines 7 2026-05-23
SKW6255 SkyWest Airlines 7 2026-04-25
SKW5002 - 7 2026-07-14
SKW4934 SkyWest Airlines 7 2026-05-26
SKW4907 - 7 2026-07-13
SKW6412 - 6 2026-06-24
SKW6410 SkyWest Airlines 6 2026-05-02
SKW6275 SkyWest Airlines 6 2026-05-25
SKW4892 - 6 2026-07-13
SKW6390 - 5 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW6405 - Jul 14, 03:45 UTCJul 14, 04:55 UTC1h 10m
2026-07-14 SKW5002 - Jul 14, 01:10 UTCJul 14, 01:55 UTC45m
2026-07-14 SKW5002 HOU → DFW Jul 14, 01:05 UTCJul 14, 01:55 UTC50m
2026-07-13 SKW5002 - Jul 13, 22:30 UTCJul 13, 23:30 UTC1h 0m
2026-07-13 SKW4963 - Jul 13, 18:55 UTCJul 13, 20:45 UTC1h 50m
2026-07-13 SKW4963 - Jul 13, 14:30 UTCJul 13, 15:45 UTC1h 15m
2026-07-13 SKW4907 - Jul 13, 11:35 UTCJul 13, 12:25 UTC50m
2026-07-13 SKW4907 MAF → DFW Jul 13, 11:13 UTCJul 13, 12:25 UTC1h 12m
2026-07-13 SKW4892 - Jul 13, 04:05 UTCJul 13, 05:35 UTC1h 30m
2026-07-13 SKW4892 PHX → MAF Jul 13, 03:18 UTCJul 13, 05:37 UTC2h 19m
2026-07-13 SKW4891 - Jul 13, 00:40 UTCJul 13, 02:05 UTC1h 25m
2026-07-12 SKW4891 PHX → SBP Jul 12, 22:00 UTCJul 12, 23:10 UTC1h 10m
2026-07-12 SKW6394 - Jul 12, 20:01 UTCJul 12, 21:10 UTC1h 10m
2026-07-12 SKW6394 PHX → BFL Jul 12, 18:25 UTCJul 12, 19:20 UTC55m
2026-07-12 SKW6431 - Jul 12, 15:55 UTCJul 12, 16:50 UTC55m
2026-07-12 SKW6431 GJT → PHX Jul 12, 15:52 UTCJul 12, 16:48 UTC56m
2026-07-12 SKW6318 - Jul 12, 05:01 UTCJul 12, 05:50 UTC50m
2026-07-12 SKW6318 PHX → GJT Jul 12, 04:59 UTCJul 12, 06:05 UTC1h 6m
2026-07-12 SKW4927 - Jul 12, 02:10 UTCJul 12, 03:20 UTC1h 10m
2026-07-12 SKW4927 SBA → PHX Jul 12, 02:04 UTCJul 12, 03:20 UTC1h 16m
2026-07-12 SKW4927 - Jul 12, 00:01 UTCJul 12, 01:00 UTC1h 0m
2026-07-11 SKW6373 - Jul 11, 22:20 UTCJul 11, 22:45 UTC25m
2026-07-11 SKW6373 TUS → PHX Jul 11, 22:08 UTCJul 11, 22:45 UTC37m
2026-07-11 SKW6373 PHX → TUS Jul 11, 20:55 UTCJul 11, 21:25 UTC30m
2026-07-11 SKW4966 - Jul 11, 18:25 UTCJul 11, 19:10 UTC45m
2026-07-11 SKW4966 DRO → PHX Jul 11, 18:21 UTCJul 11, 19:13 UTC52m
2026-07-11 SKW4966 - Jul 11, 16:15 UTCJul 11, 16:50 UTC35m
2026-07-11 SKW6375 - Jul 11, 13:15 UTCJul 11, 14:45 UTC1h 30m
2026-07-11 SKW6374 - Jul 11, 03:50 UTCJul 11, 05:10 UTC1h 20m
2026-07-11 SKW6298 - Jul 11, 00:55 UTCJul 11, 01:50 UTC55m
2026-07-10 SKW6513 - Jul 10, 22:10 UTCJul 10, 23:45 UTC1h 35m
2026-07-10 SKW6376 - Jul 10, 19:45 UTCJul 10, 20:50 UTC1h 5m
2026-07-10 SKW6376 TUS → LAX Jul 10, 19:45 UTCJul 10, 20:44 UTC59m
2026-07-10 SKW6376 LAX → TUS Jul 10, 17:50 UTCJul 10, 19:00 UTC1h 10m
2026-07-10 SKW4896 SEA → LAX Jul 10, 14:30 UTCJul 10, 16:50 UTC2h 20m
2026-07-10 SKW4896 SEA → LAX Jul 10, 14:21 UTCJul 10, 16:45 UTC2h 24m
2026-07-10 SKW4920 - Jul 10, 02:10 UTCJul 10, 04:25 UTC2h 15m
2026-07-10 SKW4920 LAX → SEA Jul 10, 02:09 UTCJul 10, 04:30 UTC2h 21m
2026-07-09 SKW6387 - Jul 9, 23:25 UTCJul 10, 01:15 UTC1h 50m
2026-07-09 SKW6387 ASE → LAX Jul 9, 23:09 UTCJul 10, 00:54 UTC1h 45m
2026-07-09 SKW6387 - Jul 9, 20:10 UTCJul 9, 21:35 UTC1h 25m
2026-07-09 SKW6348 - Jul 9, 17:15 UTCJul 9, 18:20 UTC1h 5m
2026-07-09 SKW6348 SMF → LAX Jul 9, 17:14 UTCJul 9, 18:13 UTC59m
2026-07-09 SKW6348 - Jul 9, 15:10 UTCJul 9, 16:15 UTC1h 5m
2026-07-09 SKW4910 ELP → LAX Jul 9, 12:08 UTCJul 9, 13:45 UTC1h 37m
2026-07-09 SKW49O5 - Jul 9, 03:55 UTCJul 9, 13:50 UTC9h 55m
2026-07-09 SKW6372 - Jul 9, 01:00 UTCJul 9, 02:05 UTC1h 5m
2026-07-09 SKW6372 TUS → LAX Jul 9, 00:55 UTCJul 9, 02:04 UTC1h 9m
2026-07-08 SKW6372 - Jul 8, 23:00 UTCJul 9, 00:10 UTC1h 10m
2026-07-08 SKW5012 - Jul 8, 16:40 UTCJul 8, 21:20 UTC4h 40m

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 N720EV page for operator, model, and routing details .

Mode-S A9A404 frequently asked

What is Mode-S code A9A404?
A9A404 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N720EV.
Where is Mode-S A9A404 registered?
Mode-S code A9A404 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 A9A404 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9A404, octal 52322004, decimal 11,117,572.
What flights does A9A404 operate?
Mode-S A9A404 has broadcast 20 distinct callsigns, including SKW6311, SKW6365, SKW6321, SKW6428, SKW4949.