Apparatus

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sensors Mode-S transponder

A860D2

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N639SY · operated by SKYWEST AIRLINES INC

Hex
A860D2
Octal
52060322
Decimal
11,034,834
Country
US
Tail
N639SY
No current signal · last broadcast Jul 26, 21:30 UTC
Flights observed
89
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:30 UTC

Last known position

Most recent position reported by Mode-S A860D2.

Country allocation

The ICAO 24-bit address A860D2 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
SKW582Y SkyWest Airlines 4 2026-07-19
SKW5594 SkyWest Airlines 4 2026-07-21
SKW5814 SkyWest Airlines 3 2026-07-22
SKW5749 SkyWest Airlines 3 2026-07-21
SKW5553 SkyWest Airlines 3 2026-07-25
SKW5290 - 3 2026-07-20
SKW5279 SkyWest Airlines 3 2026-07-26
SKW5259 - 3 2026-07-22
SKW4773 SkyWest Airlines 3 2026-07-21
SKW4766 - 3 2026-07-16
N639SY - 3 2026-06-28
SKW769W SkyWest Airlines 2 2026-07-24
SKW6080 - 2 2026-07-12
SKW5988 SkyWest Airlines 2 2026-07-17
SKW5956 SkyWest Airlines 2 2026-07-22
SKW5493 SkyWest Airlines 2 2026-07-26
SKW5469 - 2 2026-07-19
SKW5450 - 2 2026-07-15
SKW5443 SkyWest Airlines 2 2026-07-21
SKW5386 - 2 2026-07-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5493 SMF → SFO Jul 26, 19:30 UTCJul 26, 21:30 UTC2h 0m
2026-07-26 SKW5279 DEN → FSD Jul 26, 14:45 UTCJul 26, 17:10 UTC2h 25m
2026-07-26 SKW5279 DEN → FSD Jul 26, 14:23 UTCJul 26, 17:37 UTC3h 14m
2026-07-25 SKW4679 CAK → ORD Jul 25, 23:45 UTCJul 26, 01:15 UTC1h 30m
2026-07-25 SKW5665 DEN → SLC Jul 25, 21:45 UTCJul 25, 22:45 UTC1h 0m
2026-07-25 SKW5621 IAH → SAF Jul 25, 17:55 UTCJul 25, 19:40 UTC1h 45m
2026-07-25 SKW5614 OKC → IAH Jul 25, 14:30 UTCJul 25, 16:05 UTC1h 35m
2026-07-25 SKW5553 SFO → SNA Jul 25, 11:30 UTCJul 25, 12:25 UTC55m
2026-07-24 SKW769W ORD → DTW Jul 24, 23:35 UTCJul 25, 00:20 UTC45m
2026-07-24 SKW5780 SAT → IAH Jul 24, 19:40 UTCJul 24, 21:15 UTC1h 35m
2026-07-24 SKW565J ORD → CMX Jul 24, 17:10 UTCJul 24, 18:25 UTC1h 15m
2026-07-24 SKW5300 LCH → IAH Jul 24, 13:25 UTCJul 24, 15:30 UTC2h 5m
2026-07-24 SKW5300 LCH → IAH Jul 24, 13:28 UTCJul 24, 15:26 UTC1h 58m
2026-07-23 SKW5917 SFO → SEA Jul 23, 22:50 UTCJul 24, 00:40 UTC1h 50m
2026-07-23 SKW5493 SMF → SFO Jul 23, 19:35 UTCJul 23, 21:30 UTC1h 55m
2026-07-23 SKW5279 DEN → FSD Jul 23, 14:35 UTCJul 23, 16:50 UTC2h 15m
2026-07-23 SKW5553 SFO → SNA Jul 23, 11:25 UTCJul 23, 12:20 UTC55m
2026-07-23 SKW5553 SFO → SNA Jul 23, 11:26 UTCJul 23, 12:20 UTC54m
2026-07-22 SKW769W ORD → DTW Jul 22, 23:20 UTCJul 23, 00:10 UTC50m
2026-07-22 SKW5956 ASE → ORD Jul 22, 18:55 UTCJul 22, 21:00 UTC2h 5m
2026-07-22 SKW5814 RNO → SFO Jul 22, 15:00 UTCJul 22, 16:55 UTC1h 55m
2026-07-22 SKW5259 - Jul 22, 12:25 UTCJul 22, 13:10 UTC45m
2026-07-22 SKW376Z DEN → SHV Jul 22, 00:10 UTCJul 22, 02:00 UTC1h 50m
2026-07-21 SKW5749 PIT → ORD Jul 21, 21:45 UTCJul 21, 22:10 UTC25m
2026-07-21 SKW342F DEN → GUC Jul 21, 19:52 UTCJul 21, 20:20 UTC28m
2026-07-21 SKW5594 PSC → SFO Jul 21, 16:35 UTCJul 21, 17:50 UTC1h 15m
2026-07-21 SKW5594 PSC → SFO Jul 21, 16:44 UTCJul 21, 17:45 UTC1h 1m
2026-07-21 SKW5443 BHM → ORD Jul 21, 14:25 UTCJul 21, 15:30 UTC1h 5m
2026-07-21 SKW4716 SAN → SFO Jul 21, 10:55 UTCJul 21, 12:45 UTC1h 50m
2026-07-21 SKW4773 ORD → DTW Jul 21, 03:10 UTCJul 21, 04:45 UTC1h 35m
2026-07-20 SKW5694 GRB → ORD Jul 20, 22:30 UTCJul 21, 00:05 UTC1h 35m
2026-07-20 SKW5641 DEN → XNA Jul 20, 19:50 UTCJul 20, 21:20 UTC1h 30m
2026-07-20 SKW6041 - Jul 20, 16:55 UTCJul 20, 18:30 UTC1h 35m
2026-07-20 SKW5290 - Jul 20, 01:20 UTCJul 20, 04:35 UTC3h 15m
2026-07-19 SKW5469 - Jul 19, 22:45 UTCJul 19, 23:55 UTC1h 10m
2026-07-19 SKW582Y ORD → CVG Jul 19, 20:54 UTCJul 19, 21:30 UTC36m
2026-07-19 SKW582Y ORD → CVG Jul 19, 20:50 UTCJul 19, 21:20 UTC30m
2026-07-19 SKW4669 - Jul 19, 15:45 UTCJul 19, 18:15 UTC2h 30m
2026-07-19 SKW5254 EUG → SFO Jul 19, 01:24 UTCJul 19, 03:38 UTC2h 14m
2026-07-19 SKW5254 EUG → SFO Jul 19, 01:10 UTCJul 19, 03:20 UTC2h 10m
2026-07-18 SKW5956 - Jul 18, 21:00 UTCJul 18, 23:25 UTC2h 25m
2026-07-18 SKW5814 - Jul 18, 16:10 UTCJul 18, 18:25 UTC2h 15m
2026-07-18 SKW5814 IAH → ASE Jul 18, 16:05 UTCJul 18, 18:41 UTC2h 36m
2026-07-18 SKW5259 - Jul 18, 12:55 UTCJul 18, 13:35 UTC40m
2026-07-18 SKW5259 SHV → IAH Jul 18, 12:59 UTCJul 18, 13:36 UTC37m
2026-07-18 SKW376Z DEN → SHV Jul 18, 00:04 UTCJul 18, 01:54 UTC1h 50m
2026-07-17 SKW5749 PIT → ORD Jul 17, 22:00 UTCJul 17, 22:45 UTC45m
2026-07-17 SKW5749 PIT → ORD Jul 17, 22:07 UTCJul 17, 22:43 UTC36m
2026-07-17 SKW342F - Jul 17, 19:55 UTCJul 17, 20:20 UTC25m
2026-07-17 SKW5594 PSC → SFO Jul 17, 16:40 UTCJul 17, 17:44 UTC1h 5m

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 N639SY page for operator, model, and routing details .

Mode-S A860D2 frequently asked

What is Mode-S code A860D2?
A860D2 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N639SY.
Where is Mode-S A860D2 registered?
Mode-S code A860D2 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 A860D2 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A860D2, octal 52060322, decimal 11,034,834.
What flights does A860D2 operate?
Mode-S A860D2 has broadcast 20 distinct callsigns, including SKW582Y, SKW5594, SKW5814, SKW5749, SKW5553.