Apparatus

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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 SKW4722 · 5,150 ft
Flights observed
594
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:00 UTC

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
SKW5478 - 5 2026-07-14
SKW5392 SkyWest Airlines 5 2026-07-25
SKW5351 SkyWest Airlines 5 2026-05-14
SKW5315 SkyWest Airlines 5 2026-07-23
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
SKW5886 - 4 2026-07-21
SKW5765 - 4 2026-07-12
SKW5760 - 4 2026-07-14
SKW5701 - 4 2026-07-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW4668 PHX → SFO Jul 26, 17:35 UTCJul 26, 19:35 UTC2h 0m
2026-07-26 SKW5561 FAT → SFO Jul 26, 13:50 UTCJul 26, 15:45 UTC1h 55m
2026-07-25 SKW5396 BUR → SFO Jul 25, 23:20 UTCJul 26, 00:00 UTC40m
2026-07-25 SKW5376 ERI → ORD Jul 25, 21:15 UTCJul 25, 22:15 UTC1h 0m
2026-07-25 SKW5692 CID → DEN Jul 25, 18:25 UTCJul 25, 19:35 UTC1h 10m
2026-07-25 SKW5717 ABE → ORD Jul 25, 15:05 UTCJul 25, 16:35 UTC1h 30m
2026-07-25 SKW5717 ABE → ORD Jul 25, 15:06 UTCJul 25, 16:18 UTC1h 12m
2026-07-25 SKW5325 SNA → SFO Jul 25, 12:45 UTCJul 25, 13:50 UTC1h 5m
2026-07-25 SKW5325 SNA → SFO Jul 25, 12:44 UTCJul 25, 14:05 UTC1h 21m
2026-07-25 SKW5453 SFO → SAT Jul 25, 10:15 UTCJul 25, 11:20 UTC1h 5m
2026-07-25 SKW5392 LAX → SFO Jul 25, 01:30 UTCJul 25, 03:15 UTC1h 45m
2026-07-25 SKW5392 LAX → SFO Jul 25, 01:22 UTCJul 25, 03:12 UTC1h 50m
2026-07-24 SKW5702 ASE → ORD Jul 24, 21:05 UTCJul 25, 00:00 UTC2h 55m
2026-07-24 SKW4703 - Jul 24, 17:20 UTCJul 24, 19:15 UTC1h 55m
2026-07-24 SKW4703 ORD → PVD Jul 24, 17:18 UTCJul 24, 19:11 UTC1h 53m
2026-07-24 SKW5823 OKC → ORD Jul 24, 14:01 UTCJul 24, 15:42 UTC1h 41m
2026-07-24 SKW5823 OKC → ORD Jul 24, 13:55 UTCJul 24, 15:55 UTC2h 0m
2026-07-24 SKW5281 TUS → SFO Jul 24, 03:05 UTCJul 24, 04:10 UTC1h 5m
2026-07-24 SKW5658 PHL → ORD Jul 24, 00:30 UTCJul 24, 01:25 UTC55m
2026-07-23 SKW5379 RNO → SFO Jul 23, 21:55 UTCJul 23, 22:30 UTC35m
2026-07-23 SKW5637 ORD → MDT Jul 23, 18:45 UTCJul 23, 19:55 UTC1h 10m
2026-07-23 SKW5637 ORD → MDT Jul 23, 18:54 UTCJul 23, 19:59 UTC1h 5m
2026-07-23 SKW5315 ASE → ORD Jul 23, 16:30 UTCJul 23, 17:50 UTC1h 20m
2026-07-23 SKW5545 ORD → HPN Jul 23, 10:25 UTCJul 23, 12:25 UTC2h 0m
2026-07-23 SKW5545 ORD → HPN Jul 23, 10:19 UTCJul 23, 12:26 UTC2h 7m
2026-07-22 SKW4740 GTF → DEN Jul 22, 23:15 UTCJul 22, 23:40 UTC25m
2026-07-22 SKW5623 ORD → BHM Jul 22, 18:20 UTCJul 22, 21:15 UTC2h 55m
2026-07-22 SKW6014 SFO → GEG Jul 22, 15:30 UTCJul 22, 17:05 UTC1h 35m
2026-07-22 SKW4724 - Jul 22, 13:25 UTCJul 22, 14:05 UTC40m
2026-07-22 SKW5339 SAV → ORD Jul 22, 02:55 UTCJul 22, 04:00 UTC1h 5m
2026-07-22 SKW5650 - Jul 22, 00:35 UTCJul 22, 01:45 UTC1h 10m
2026-07-21 SKW5938 FCA → SFO Jul 21, 22:05 UTCJul 21, 23:25 UTC1h 20m
2026-07-21 SKW4757 - Jul 21, 17:35 UTCJul 21, 19:45 UTC2h 10m
2026-07-21 SKW5898 SGF → DEN Jul 21, 14:10 UTCJul 21, 15:45 UTC1h 35m
2026-07-21 SKW5886 - Jul 21, 00:00 UTCJul 21, 01:25 UTC1h 25m
2026-07-20 SKW5788 ORD → LGA Jul 20, 22:20 UTCJul 20, 22:50 UTC30m
2026-07-20 SKW5788 ORD → LGA Jul 20, 22:14 UTCJul 20, 22:39 UTC25m
2026-07-20 SKW5789 - Jul 20, 20:30 UTCJul 20, 20:55 UTC25m
2026-07-20 SKW5288 - Jul 20, 17:30 UTCJul 20, 18:50 UTC1h 20m
2026-07-20 SKW5288 DSM → DEN Jul 20, 17:05 UTCJul 20, 18:48 UTC1h 43m
2026-07-20 SKW4801 IND → ORD Jul 20, 14:10 UTCJul 20, 15:30 UTC1h 20m
2026-07-20 SKW5701 FSD → DEN Jul 20, 11:24 UTCJul 20, 12:16 UTC52m
2026-07-20 SKW5701 FSD → DEN Jul 20, 11:05 UTCJul 20, 12:20 UTC1h 15m
2026-07-20 SKW309L DEN → FSD Jul 20, 03:35 UTCJul 20, 04:45 UTC1h 10m
2026-07-20 SKW5503 - Jul 20, 00:35 UTCJul 20, 01:50 UTC1h 15m
2026-07-19 SKW5385 DEN → SJC Jul 19, 22:05 UTCJul 19, 23:15 UTC1h 10m
2026-07-19 SKW5972 - Jul 19, 18:40 UTCJul 19, 19:45 UTC1h 5m
2026-07-19 SKW5972 ICT → DEN Jul 19, 18:48 UTCJul 19, 19:42 UTC54m
2026-07-19 SKW5497 DEN → ICT Jul 19, 16:20 UTCJul 19, 17:20 UTC1h 0m
2026-07-19 SKW4706 - Jul 19, 13:35 UTCJul 19, 14:30 UTC55m

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.