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sensors Mode-S transponder

A09A90

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N138SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A09A90
Octal
50115220
Decimal
10,525,328
Country
US
Tail
N138SY
Type
E75L
Broadcasting now · callsign SKW5760 · 33,875 ft
Flights observed
524
Distinct callsigns
20
Country
US
Last broadcast
6m ago

Current position

A09A90 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A09A90 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
SKW5937 SkyWest Airlines 10 2026-05-13
SKW5805 SkyWest Airlines 9 2026-05-13
SKW5549 SkyWest Airlines 8 2026-05-13
SKW5440 SkyWest Airlines 8 2026-05-13
SKW6001 - 6 2026-07-11
SKW5763 SkyWest Airlines 5 2026-06-22
SKW5522 SkyWest Airlines 5 2026-05-13
SKW5351 SkyWest Airlines 5 2026-05-14
SKW4722 SkyWest Airlines 5 2026-05-08
SKW6027 - 4 2026-07-06
SKW6004 - 4 2026-06-22
SKW6000 SkyWest Airlines 4 2026-06-09
SKW5990 SkyWest Airlines 4 2026-06-09
SKW5765 - 4 2026-07-12
SKW5760 - 4 2026-07-14
SKW5684 SkyWest Airlines 4 2026-06-06
SKW5478 - 4 2026-06-23
SKW5413 SkyWest Airlines 4 2026-06-09
SKW5315 SkyWest Airlines 4 2026-04-29
SKW5296 - 4 2026-06-19

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 SKW5760 - Jul 14, 19:40 UTCJul 14, 20:00 UTC20m
2026-07-14 SKW5490 OKC → DEN Jul 14, 16:50 UTCJul 14, 18:00 UTC1h 10m
2026-07-14 SKW6029 - Jul 14, 14:15 UTCJul 14, 15:30 UTC1h 15m
2026-07-14 SKW6029 DEN → OKC Jul 14, 14:15 UTCJul 14, 15:25 UTC1h 10m
2026-07-14 SKW4716 - Jul 14, 10:35 UTCJul 14, 12:10 UTC1h 35m
2026-07-14 SKW4716 CID → DEN Jul 14, 10:48 UTCJul 14, 12:05 UTC1h 17m
2026-07-14 SKW4773 DEN → CID Jul 14, 02:55 UTCJul 14, 04:30 UTC1h 35m
2026-07-13 SKW5632 DEN → DEN Jul 13, 20:10 UTCJul 14, 01:15 UTC5h 5m
2026-07-13 SKW5991 - Jul 13, 18:10 UTCJul 13, 18:45 UTC35m
2026-07-13 SKW5991 FCA → DEN Jul 13, 17:04 UTCJul 13, 18:58 UTC1h 54m
2026-07-13 SKW5476 - Jul 13, 14:05 UTCJul 13, 14:45 UTC40m
2026-07-13 SKW5667 - Jul 13, 11:10 UTCJul 13, 12:30 UTC1h 20m
2026-07-13 SKW4712 - Jul 13, 03:30 UTCJul 13, 04:45 UTC1h 15m
2026-07-13 SKW4712 DEN → TUL Jul 13, 03:28 UTCJul 13, 04:41 UTC1h 13m
2026-07-12 SKW5260 - Jul 12, 21:40 UTCJul 13, 00:10 UTC2h 30m
2026-07-12 SKW5765 IAH → SHV Jul 12, 19:45 UTCJul 12, 20:20 UTC35m
2026-07-12 SKW5765 IAH → SHV Jul 12, 19:47 UTCJul 12, 20:20 UTC33m
2026-07-12 SKW5223 MTY → IAH Jul 12, 16:12 UTCJul 12, 17:17 UTC1h 5m
2026-07-12 SKW5223 - Jul 12, 16:10 UTCJul 12, 17:20 UTC1h 10m
2026-07-12 SKW5222 - Jul 12, 13:10 UTCJul 12, 14:20 UTC1h 10m
2026-07-11 SKW5243 - Jul 11, 23:25 UTCJul 12, 00:35 UTC1h 10m
2026-07-11 SKW6001 - Jul 11, 18:30 UTCJul 11, 22:10 UTC3h 40m
2026-07-11 SKW5596 MTY → SFO Jul 11, 11:45 UTCJul 11, 15:05 UTC3h 20m
2026-07-11 SKW5242 - Jul 11, 00:10 UTCJul 11, 01:25 UTC1h 15m
2026-07-10 SKW5837 - Jul 10, 20:40 UTCJul 10, 21:20 UTC40m
2026-07-10 SKW5837 SHV → IAH Jul 10, 20:48 UTCJul 10, 21:20 UTC32m
2026-07-10 SKW5253 DEN → SHV Jul 10, 17:15 UTCJul 10, 19:00 UTC1h 45m
2026-07-10 SKW5558 - Jul 10, 13:25 UTCJul 10, 15:35 UTC2h 10m
2026-07-10 SKW4774 - Jul 10, 01:40 UTCJul 10, 03:55 UTC2h 15m
2026-07-09 SKW5788 - Jul 9, 23:45 UTCJul 10, 00:10 UTC25m
2026-07-09 SKW5789 DEN → HDN Jul 9, 20:00 UTCJul 9, 21:06 UTC1h 6m
2026-07-09 SKW5789 - Jul 9, 20:00 UTCJul 9, 20:50 UTC50m
2026-07-09 SKW4804 - Jul 9, 17:35 UTCJul 9, 18:45 UTC1h 10m
2026-07-09 SKW4809 - Jul 9, 15:00 UTCJul 9, 16:20 UTC1h 20m
2026-07-09 SKW4809 ORD → ICT Jul 9, 15:01 UTCJul 9, 16:23 UTC1h 22m
2026-07-09 SKW5191 MKE → ORD Jul 9, 13:10 UTCJul 9, 13:35 UTC25m
2026-07-09 SKW5191 MKE → ORD Jul 9, 13:17 UTCJul 9, 13:35 UTC18m
2026-07-08 SKW4774 - Jul 8, 01:25 UTCJul 8, 03:20 UTC1h 55m
2026-07-07 SKW4640 ACV → LAX Jul 7, 13:35 UTCJul 7, 15:50 UTC2h 15m
2026-07-07 SKW5356 - Jul 7, 00:10 UTCJul 7, 02:25 UTC2h 15m
2026-07-06 SKW5673 - Jul 6, 22:00 UTCJul 6, 22:30 UTC30m
2026-07-06 SKW5616 - Jul 6, 19:40 UTCJul 6, 20:10 UTC30m
2026-07-06 SKW6041 BOI → DEN Jul 6, 16:25 UTCJul 6, 18:00 UTC1h 35m
2026-07-06 SKW6027 - Jul 6, 05:00 UTCJul 6, 06:10 UTC1h 10m
2026-07-06 SKW5631 - Jul 6, 03:00 UTCJul 6, 04:05 UTC1h 5m
2026-07-06 SKW5354 - Jul 6, 00:05 UTCJul 6, 01:05 UTC1h 0m
2026-07-05 SKW4661 - Jul 5, 21:40 UTCJul 5, 23:15 UTC1h 35m
2026-07-05 SKW4661 BOI → SFO Jul 5, 20:15 UTCJul 5, 22:59 UTC2h 44m
2026-07-05 SKW430A - Jul 5, 17:35 UTCJul 5, 19:00 UTC1h 25m
2026-07-05 SKW430A SFO → BOI Jul 5, 17:34 UTCJul 5, 18:41 UTC1h 7m

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 N138SY page for operator, model, and routing details .

Mode-S A09A90 frequently asked

What is Mode-S code A09A90?
A09A90 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N138SY.
Where is Mode-S A09A90 registered?
Mode-S code A09A90 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 A09A90 broadcasting right now?
Yes. Mode-S A09A90 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A09A90, octal 50115220, decimal 10,525,328.
What flights does A09A90 operate?
Mode-S A09A90 has broadcast 20 distinct callsigns, including SKW5937, SKW5805, SKW5549, SKW5440, SKW6001.