Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A09E47

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N139SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A09E47
Octal
50117107
Decimal
10,526,279
Country
US
Tail
N139SY
Type
E75L
Broadcasting now · callsign SKW5876 · 15,750 ft
Flights observed
673
Distinct callsigns
20
Country
US
Last broadcast
Jul 23, 19:15 UTC

Current position

A09E47 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A09E47 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
SKW5453 - 9 2026-07-22
SKW5222 - 9 2026-07-22
SKW5223 - 8 2026-07-22
SKW5623 - 7 2026-06-24
SKW6014 - 6 2026-06-24
SKW5765 SkyWest Airlines 6 2026-07-22
SKW5760 - 6 2026-06-30
SKW5540 - 6 2026-07-06
SKW5475 - 6 2026-06-26
SKW5334 - 6 2026-07-12
SKW4673 - 6 2026-07-16
SKW5764 SkyWest Airlines 5 2026-05-20
SKW5593 SkyWest Airlines 5 2026-06-11
SKW5531 - 5 2026-07-18
SKW5503 - 5 2026-07-11
SKW5497 - 5 2026-07-10
SKW5397 SkyWest Airlines 5 2026-06-03
SKW5287 SkyWest Airlines 5 2026-06-18
SKW5279 SkyWest Airlines 5 2026-06-08
SKW5278 SkyWest Airlines 5 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-23 SKW6080 BNA → ORD Jul 23, 17:45 UTCJul 23, 19:15 UTC1h 30m
2026-07-23 SKW6080 BNA → ORD Jul 23, 17:38 UTCJul 23, 19:17 UTC1h 39m
2026-07-23 SKW4706 IDA → DEN Jul 23, 13:25 UTCJul 23, 14:25 UTC1h 0m
2026-07-23 SKW519M DEN → IDA Jul 23, 02:10 UTCJul 23, 03:10 UTC1h 0m
2026-07-22 SKW5260 SFO → SNA Jul 22, 22:30 UTCJul 23, 00:50 UTC2h 20m
2026-07-22 SKW5765 SFO → BOI Jul 22, 19:55 UTCJul 22, 20:30 UTC35m
2026-07-22 SKW5765 SFO → BOI Jul 22, 19:47 UTCJul 22, 20:31 UTC44m
2026-07-22 SKW5223 - Jul 22, 16:05 UTCJul 22, 17:15 UTC1h 10m
2026-07-22 SKW5222 IAH → MTY Jul 22, 13:15 UTCJul 22, 14:20 UTC1h 5m
2026-07-22 SKW5453 - Jul 22, 11:10 UTCJul 22, 11:20 UTC10m
2026-07-22 SKW5453 OKC → IAH Jul 22, 10:15 UTCJul 22, 11:07 UTC52m
2026-07-22 SKW5278 HPN → ORD Jul 22, 01:05 UTCJul 22, 02:05 UTC1h 0m
2026-07-22 SKW5278 HPN → ORD Jul 22, 00:57 UTCJul 22, 02:04 UTC1h 7m
2026-07-21 SKW5798 - Jul 21, 21:15 UTCJul 21, 22:20 UTC1h 5m
2026-07-21 SKW5798 MEM → IAH Jul 21, 21:19 UTCJul 21, 22:17 UTC58m
2026-07-21 SKW5414 FAR → DEN Jul 21, 18:55 UTCJul 21, 20:05 UTC1h 10m
2026-07-21 SKW5732 - Jul 21, 17:30 UTCJul 21, 17:45 UTC15m
2026-07-21 SKW5732 - Jul 21, 15:15 UTCJul 21, 15:45 UTC30m
2026-07-21 SKW5732 RDU → ORD Jul 21, 15:15 UTCJul 21, 17:12 UTC1h 57m
2026-07-21 SKW5926 SNA → SFO Jul 21, 12:40 UTCJul 21, 14:10 UTC1h 30m
2026-07-20 SKW5751 SFO → SMF Jul 20, 23:05 UTCJul 21, 00:50 UTC1h 44m
2026-07-20 SKW5751 SFO → SMF Jul 20, 23:03 UTCJul 21, 00:32 UTC1h 29m
2026-07-20 SKW5757 SAT → IAH Jul 20, 20:10 UTCJul 20, 21:40 UTC1h 30m
2026-07-20 SKW5517 LAX → MFR Jul 20, 17:15 UTCJul 20, 17:45 UTC30m
2026-07-20 SKW5517 LAX → MFR Jul 20, 17:16 UTCJul 20, 17:52 UTC36m
2026-07-20 SKW5668 ORD → DCA Jul 20, 14:10 UTCJul 20, 14:45 UTC35m
2026-07-20 SKW5786 - Jul 20, 10:20 UTCJul 20, 12:35 UTC2h 15m
2026-07-19 SKW5442 SEA → SFO Jul 19, 23:23 UTCJul 20, 01:10 UTC1h 47m
2026-07-19 SKW5442 SEA → SFO Jul 19, 23:15 UTCJul 20, 01:15 UTC2h 0m
2026-07-19 SKW4795 - Jul 19, 19:25 UTCJul 19, 21:05 UTC1h 40m
2026-07-19 SKW5413 - Jul 19, 17:10 UTCJul 19, 18:15 UTC1h 5m
2026-07-19 SKW5876 - Jul 19, 13:00 UTCJul 19, 15:10 UTC2h 10m
2026-07-18 SKW5875 - Jul 18, 22:05 UTCJul 18, 23:45 UTC1h 40m
2026-07-18 SKW5875 IAH → OAX Jul 18, 22:11 UTCJul 19, 00:05 UTC1h 54m
2026-07-18 SKW5531 - Jul 18, 19:05 UTCJul 18, 20:10 UTC1h 5m
2026-07-18 SKW5531 OKC → IAH Jul 18, 19:08 UTCJul 18, 20:08 UTC1h 0m
2026-07-18 SKW5324 DEN → OKC Jul 18, 16:40 UTCJul 18, 17:50 UTC1h 10m
2026-07-18 SKW4706 - Jul 18, 13:40 UTCJul 18, 14:35 UTC55m
2026-07-18 SKW4706 IDA → DEN Jul 18, 13:41 UTCJul 18, 14:38 UTC57m
2026-07-18 SKW519M DEN → IDA Jul 18, 01:39 UTCJul 18, 02:40 UTC1h 0m
2026-07-17 SKW5260 SFO → SNA Jul 17, 21:39 UTCJul 17, 23:25 UTC1h 45m
2026-07-17 SKW5765 - Jul 17, 19:45 UTCJul 17, 20:25 UTC40m
2026-07-17 SKW5765 IAH → SHV Jul 17, 19:47 UTCJul 17, 20:16 UTC29m
2026-07-17 SKW5223 - Jul 17, 16:49 UTCJul 17, 17:50 UTC1h 0m
2026-07-17 SKW5222 - Jul 17, 13:10 UTCJul 17, 14:20 UTC1h 10m
2026-07-17 SKW5453 - Jul 17, 10:15 UTCJul 17, 11:15 UTC1h 0m
2026-07-17 SKW5453 OKC → IAH Jul 17, 10:18 UTCJul 17, 11:20 UTC1h 2m
2026-07-17 SKW5392 - Jul 17, 02:05 UTCJul 17, 03:50 UTC1h 45m
2026-07-16 SKW5702 ASE → ORD Jul 16, 21:10 UTCJul 16, 23:35 UTC2h 25m
2026-07-16 SKW4703 - Jul 16, 16:40 UTCJul 16, 18:29 UTC1h 50m

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 N139SY page for operator, model, and routing details .

Mode-S A09E47 frequently asked

What is Mode-S code A09E47?
A09E47 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N139SY.
Where is Mode-S A09E47 registered?
Mode-S code A09E47 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 A09E47 broadcasting right now?
Yes. Mode-S A09E47 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A09E47, octal 50117107, decimal 10,526,279.
What flights does A09E47 operate?
Mode-S A09E47 has broadcast 20 distinct callsigns, including SKW5453, SKW5222, SKW5223, SKW5623, SKW6014.