Apparatus

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sensors Mode-S transponder

A2CFA2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N280SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A2CFA2
Octal
50547642
Decimal
10,669,986
Country
US
Tail
N280SY
Type
E75L
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
720
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A2CFA2.

Country allocation

The ICAO 24-bit address A2CFA2 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
SKW4449 - 21 2026-06-21
SKW3718 - 16 2026-07-02
SKW3694 - 12 2026-06-23
SKW3765 SkyWest Airlines 11 2026-06-02
SKW3736 SkyWest Airlines 11 2026-07-23
SKW3728 - 11 2026-06-23
SKW3701 - 11 2026-07-13
SKW3852 - 10 2026-06-30
SKW3693 SkyWest Airlines 10 2026-05-07
SKW108R - 10 2026-06-12
SKW3963 SkyWest Airlines 9 2026-06-03
SKW3820 SkyWest Airlines 9 2026-05-23
SKW4078 - 8 2026-07-09
SKW4052 SkyWest Airlines 8 2026-05-23
SKW4037 - 8 2026-07-02
SKW3786 SkyWest Airlines 8 2026-06-28
SKW3727 - 8 2026-06-27
SKW3723 SkyWest Airlines 8 2026-05-05
SKW3722 - 8 2026-06-29
SKW112J SkyWest Airlines 8 2026-07-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3794 SJC → SEA Jul 26, 20:10 UTCJul 26, 22:10 UTC2h 0m
2026-07-26 SKW4119 LAX → PHX Jul 26, 17:50 UTCJul 26, 18:50 UTC1h 0m
2026-07-26 SKW4119 LAX → PHX Jul 26, 17:52 UTCJul 26, 18:46 UTC54m
2026-07-26 SKW4119 LAX → PHX Jul 26, 15:40 UTCJul 26, 16:40 UTC1h 0m
2026-07-26 SKW4057 EWR → BOS Jul 26, 13:10 UTCJul 26, 14:10 UTC1h 0m
2026-07-26 SKW4057 EWR → BOS Jul 26, 13:11 UTCJul 26, 14:06 UTC55m
2026-07-26 SKW4077 LAX → PHX Jul 26, 00:55 UTCJul 26, 01:55 UTC1h 0m
2026-07-25 SKW3744 LAX → OAK Jul 25, 19:45 UTCJul 25, 20:45 UTC1h 0m
2026-07-25 SKW3680 IAD → MSP Jul 25, 15:40 UTCJul 25, 18:35 UTC2h 55m
2026-07-25 SKW194R YVR → SEA Jul 25, 13:30 UTCJul 25, 14:00 UTC30m
2026-07-25 SKW146A ATL → SBN Jul 25, 03:40 UTCJul 25, 04:15 UTC35m
2026-07-25 SKW3918 MDW → MSP Jul 25, 01:20 UTCJul 25, 01:55 UTC35m
2026-07-24 SKW3918 MDW → MSP Jul 24, 23:45 UTCJul 25, 00:15 UTC30m
2026-07-24 SKW4125 CMH → DTW Jul 24, 20:10 UTCJul 24, 21:40 UTC1h 30m
2026-07-24 SKW4125 CMH → DTW Jul 24, 20:11 UTCJul 24, 21:22 UTC1h 11m
2026-07-24 SKW4125 CMH → DTW Jul 24, 17:40 UTCJul 24, 19:10 UTC1h 30m
2026-07-24 SKW3816 SEA → SFO Jul 24, 13:35 UTCJul 24, 15:45 UTC2h 10m
2026-07-24 SKW3884 SEA → SMF Jul 24, 03:05 UTCJul 24, 05:20 UTC2h 15m
2026-07-24 SKW4153 OAK → LAX Jul 24, 00:35 UTCJul 24, 02:05 UTC1h 30m
2026-07-24 SKW4153 OAK → LAX Jul 24, 00:36 UTCJul 24, 02:04 UTC1h 28m
2026-07-23 SKW4153 OAK → LAX Jul 23, 22:15 UTCJul 23, 23:45 UTC1h 30m
2026-07-23 SKW3736 SJC → SEA Jul 23, 18:45 UTCJul 23, 20:25 UTC1h 40m
2026-07-23 SKW3736 SJC → SEA Jul 23, 18:48 UTCJul 23, 20:24 UTC1h 36m
2026-07-23 SKW3736 SJC → SEA Jul 23, 16:00 UTCJul 23, 17:55 UTC1h 55m
2026-07-23 SKW118R BOI → SEA Jul 23, 13:05 UTCJul 23, 14:15 UTC1h 10m
2026-07-23 SKW4090 MOT → MSP Jul 23, 05:00 UTCJul 23, 06:00 UTC1h 0m
2026-07-23 SKW3897 MLI → ATL Jul 23, 01:15 UTCJul 23, 02:55 UTC1h 40m
2026-07-22 SKW3897 MLI → ATL Jul 22, 22:10 UTCJul 23, 00:00 UTC1h 50m
2026-07-22 SKW4139 RAP → MSP Jul 22, 19:50 UTCJul 22, 20:30 UTC40m
2026-07-22 SKW155A SLC → EUG Jul 22, 16:55 UTCJul 22, 18:25 UTC1h 30m
2026-07-22 SKW155A SLC → EUG Jul 22, 16:58 UTCJul 22, 18:20 UTC1h 22m
2026-07-22 SKW4061 OAK → SLC Jul 22, 13:10 UTCJul 22, 14:35 UTC1h 25m
2026-07-22 SKW3797 SLC → OAK Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-22 SKW3726 EUG → SLC Jul 22, 02:20 UTCJul 22, 03:35 UTC1h 15m
2026-07-22 SKW3726 EUG → SLC Jul 22, 00:05 UTCJul 22, 01:30 UTC1h 25m
2026-07-21 SKW3892 ICT → MSP Jul 21, 21:05 UTCJul 21, 22:25 UTC1h 20m
2026-07-21 SKW3892 ICT → MSP Jul 21, 18:40 UTCJul 21, 19:50 UTC1h 10m
2026-07-21 SKW3719 LEX → DTW Jul 21, 16:20 UTCJul 21, 17:30 UTC1h 10m
2026-07-21 SKW3719 LEX → DTW Jul 21, 14:05 UTCJul 21, 15:15 UTC1h 10m
2026-07-20 SKW4155 SLC → BZN Jul 20, 22:15 UTCJul 20, 23:50 UTC1h 35m
2026-07-20 SKW4149 EUG → SEA Jul 20, 20:30 UTCJul 20, 21:25 UTC55m
2026-07-20 SKW3749 ALB → DTW Jul 20, 18:35 UTCJul 20, 19:15 UTC40m
2026-07-20 SKW3873 - Jul 20, 04:40 UTCJul 20, 05:20 UTC40m
2026-07-20 SKW4141 RDM → SEA Jul 20, 02:45 UTCJul 20, 03:30 UTC45m
2026-07-20 SKW4141 RDM → SEA Jul 20, 01:00 UTCJul 20, 01:45 UTC45m
2026-07-19 SKW142Y YVR → SEA Jul 19, 23:00 UTCJul 19, 23:35 UTC35m
2026-07-19 SKW3748 SJC → SEA Jul 19, 21:25 UTCJul 19, 21:55 UTC30m
2026-07-19 SKW112J YVR → SEA Jul 19, 18:30 UTCJul 19, 19:05 UTC35m
2026-07-19 SKW123J SEA → YVR Jul 19, 16:35 UTCJul 19, 17:05 UTC30m
2026-07-19 SKW118R BOI → SEA Jul 19, 13:15 UTCJul 19, 14:15 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 N280SY page for operator, model, and routing details .

Mode-S A2CFA2 frequently asked

What is Mode-S code A2CFA2?
A2CFA2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N280SY.
Where is Mode-S A2CFA2 registered?
Mode-S code A2CFA2 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 A2CFA2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A2CFA2, octal 50547642, decimal 10,669,986.
What flights does A2CFA2 operate?
Mode-S A2CFA2 has broadcast 20 distinct callsigns, including SKW4449, SKW3718, SKW3694, SKW3765, SKW3736.