Apparatus

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sensors Mode-S transponder

AA8859

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N778SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
AA8859
Octal
52504131
Decimal
11,176,025
Country
US
Tail
N778SK
Type
CRJ7
No current signal · last broadcast 8d ago
Flights observed
607
Distinct callsigns
20
Country
US
Last broadcast
8d ago

Last known position

Most recent position reported by Mode-S AA8859.

Country allocation

The ICAO 24-bit address AA8859 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
SKW3986 - 61 2026-07-03
SKW3792 - 50 2026-07-02
SKW4022 SkyWest Airlines 47 2026-06-02
SKW3860 SkyWest Airlines 34 2026-06-05
SKW3964 SkyWest Airlines 31 2026-07-02
SKW3739 SkyWest Airlines 26 2026-07-01
SKW3919 SkyWest Airlines 25 2026-06-02
SKW3966 SkyWest Airlines 23 2026-05-06
SKW3936 SkyWest Airlines 22 2026-05-06
SKW3979 SkyWest Airlines 21 2026-07-03
SKW3586 SkyWest Airlines 21 2026-07-03
SKW3977 SkyWest Airlines 20 2026-06-06
SKW3885 - 17 2026-07-04
SKW3752 SkyWest Airlines 17 2026-05-01
SKW3655 SkyWest Airlines 17 2026-05-03
SKW4081 - 16 2026-07-04
SKW4013 SkyWest Airlines 16 2026-06-06
SKW4051 SkyWest Airlines 14 2026-05-04
SKW3982 SkyWest Airlines 14 2026-05-03
SKW4313 - 11 2026-06-15

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-05 SKW4607 - Jul 5, 03:00 UTCJul 5, 04:45 UTC1h 45m
2026-07-04 SKW4607 - Jul 4, 20:50 UTCJul 4, 23:55 UTC3h 5m
2026-07-04 SKW4034 - Jul 4, 19:15 UTCJul 4, 19:50 UTC35m
2026-07-04 SKW4034 SBN → DTW Jul 4, 19:22 UTCJul 4, 19:46 UTC24m
2026-07-04 SKW4034 - Jul 4, 17:40 UTCJul 4, 18:05 UTC25m
2026-07-04 SKW3898 - Jul 4, 16:10 UTCJul 4, 16:30 UTC20m
2026-07-04 SKW3898 - Jul 4, 14:55 UTCJul 4, 15:20 UTC25m
2026-07-04 SKW3885 - Jul 4, 13:25 UTCJul 4, 13:50 UTC25m
2026-07-04 SKW3885 GRR → DTW Jul 4, 13:32 UTCJul 4, 13:48 UTC16m
2026-07-04 SKW4081 - Jul 4, 01:55 UTCJul 4, 02:20 UTC25m
2026-07-03 SKW3586 SEA → SFO Jul 3, 23:30 UTCJul 3, 23:50 UTC20m
2026-07-03 SKW3586 SEA → SFO Jul 3, 23:34 UTCJul 3, 23:45 UTC11m
2026-07-03 SKW3586 SEA → SFO Jul 3, 21:10 UTCJul 3, 21:25 UTC15m
2026-07-03 SKW3979 JFK → ORD Jul 3, 19:15 UTCJul 3, 19:40 UTC25m
2026-07-03 SKW3979 JFK → ORD Jul 3, 19:18 UTCJul 3, 19:30 UTC12m
2026-07-03 SKW3979 JFK → ORD Jul 3, 17:40 UTCJul 3, 18:05 UTC25m
2026-07-03 SKW3986 - Jul 3, 16:00 UTCJul 3, 16:25 UTC25m
2026-07-03 SKW3986 - Jul 3, 14:25 UTCJul 3, 14:50 UTC25m
2026-07-03 SKW3885 - Jul 3, 12:40 UTCJul 3, 13:05 UTC25m
2026-07-03 SKW4081 - Jul 3, 00:40 UTCJul 3, 01:05 UTC25m
2026-07-02 SKW3964 DTW → MSN Jul 2, 22:35 UTCJul 2, 22:55 UTC20m
2026-07-02 SKW3964 DTW → MSN Jul 2, 21:20 UTCJul 2, 21:40 UTC20m
2026-07-02 SKW3792 - Jul 2, 19:30 UTCJul 2, 20:25 UTC55m
2026-07-02 SKW3792 - Jul 2, 17:50 UTCJul 2, 18:35 UTC45m
2026-07-02 SKW3986 - Jul 2, 15:50 UTCJul 2, 16:15 UTC25m
2026-07-02 SKW3986 - Jul 2, 14:10 UTCJul 2, 14:35 UTC25m
2026-07-02 SKW3885 - Jul 2, 12:25 UTCJul 2, 12:50 UTC25m
2026-07-02 SKW4081 - Jul 2, 00:15 UTCJul 2, 00:40 UTC25m
2026-07-01 SKW3964 DTW → MSN Jul 1, 22:30 UTCJul 1, 22:55 UTC25m
2026-07-01 SKW3964 DTW → MSN Jul 1, 21:00 UTCJul 1, 21:25 UTC25m
2026-07-01 SKW3792 - Jul 1, 18:25 UTCJul 1, 19:20 UTC55m
2026-07-01 SKW3792 - Jul 1, 16:35 UTCJul 1, 17:20 UTC45m
2026-07-01 SKW3739 LAX → OAK Jul 1, 14:25 UTCJul 1, 15:05 UTC40m
2026-07-01 SKW3739 LAX → OAK Jul 1, 12:35 UTCJul 1, 13:10 UTC35m
2026-07-01 SKW3909 - Jul 1, 09:40 UTCJul 1, 10:05 UTC25m
2026-07-01 SKW3909 DTW → AZO Jul 1, 03:10 UTCJul 1, 03:35 UTC25m
2026-06-30 SKW3964 DTW → MSN Jun 30, 23:10 UTCJun 30, 23:30 UTC20m
2026-06-30 SKW3964 DTW → MSN Jun 30, 21:55 UTCJun 30, 22:20 UTC25m
2026-06-30 SKW3792 - Jun 30, 20:05 UTCJun 30, 21:00 UTC55m
2026-06-30 SKW3792 - Jun 30, 18:20 UTCJun 30, 19:05 UTC45m
2026-06-30 SKW3739 LAX → OAK Jun 30, 16:30 UTCJun 30, 17:05 UTC35m
2026-06-30 SKW3739 LAX → OAK Jun 30, 14:55 UTCJun 30, 15:30 UTC35m
2026-06-30 SKW3817 - Jun 30, 13:20 UTCJun 30, 13:45 UTC25m
2026-06-30 SKW3646 RDM → SEA Jun 30, 06:35 UTCJun 30, 07:00 UTC25m
2026-06-29 SKW4116 GRR → DTW Jun 29, 23:54 UTCJun 30, 00:20 UTC25m
2026-06-29 SKW4116 - Jun 29, 22:15 UTCJun 29, 22:44 UTC30m
2026-06-29 SKW3979 JFK → ORD Jun 29, 19:09 UTCJun 29, 19:35 UTC25m
2026-06-29 SKW3979 JFK → ORD Jun 29, 17:40 UTCJun 29, 18:05 UTC25m
2026-06-29 SKW3986 - Jun 29, 16:10 UTCJun 29, 16:39 UTC30m
2026-06-29 SKW3986 - Jun 29, 14:44 UTCJun 29, 15:09 UTC25m

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 N778SK page for operator, model, and routing details .

Mode-S AA8859 frequently asked

What is Mode-S code AA8859?
AA8859 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N778SK.
Where is Mode-S AA8859 registered?
Mode-S code AA8859 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 AA8859 broadcasting right now?
No active broadcast right now. Last signal was 8d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA8859, octal 52504131, decimal 11,176,025.
What flights does AA8859 operate?
Mode-S AA8859 has broadcast 20 distinct callsigns, including SKW3986, SKW3792, SKW4022, SKW3860, SKW3964.