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sensors Mode-S transponder

A9903A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N715SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A9903A
Octal
52310072
Decimal
11,112,506
Country
US
Tail
N715SK
Type
CRJ7
No current signal · last broadcast Jul 26, 22:30 UTC
Flights observed
715
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:30 UTC

Last known position

Most recent position reported by Mode-S A9903A.

Country allocation

The ICAO 24-bit address A9903A 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
SKW4966 - 16 2026-07-06
SKW6513 SkyWest Airlines 15 2026-05-15
SKW6396 SkyWest Airlines 13 2026-05-02
SKW5000 SkyWest Airlines 12 2026-05-09
SKW6408 SkyWest Airlines 10 2026-07-19
SKW6398 - 10 2026-07-10
SKW6194 SkyWest Airlines 10 2026-06-04
SKW6385 - 9 2026-07-01
SKW6250 - 9 2026-07-17
SKW4999 SkyWest Airlines 9 2026-05-01
SKW4895 SkyWest Airlines 9 2026-05-08
SKW6410 - 8 2026-07-17
SKW6377 SkyWest Airlines 8 2026-05-02
SKW6354 SkyWest Airlines 8 2026-07-25
SKW6240 SkyWest Airlines 8 2026-06-05
SKW4996 SkyWest Airlines 8 2026-07-21
SKW4891 SkyWest Airlines 8 2026-06-12
SKW6414 - 7 2026-07-20
SKW6244 - 7 2026-07-10
SKW6205 - 7 2026-07-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5010 ORD → FSD Jul 26, 20:20 UTCJul 26, 22:30 UTC2h 10m
2026-07-26 SKW6417 DFW → ICT Jul 26, 16:40 UTCJul 26, 18:55 UTC2h 15m
2026-07-26 SKW6417 DFW → ICT Jul 26, 16:36 UTCJul 26, 19:22 UTC2h 46m
2026-07-26 SKW6493 ORD → RST Jul 26, 13:25 UTCJul 26, 15:05 UTC1h 40m
2026-07-26 SKW6493 ORD → RST Jul 26, 13:21 UTCJul 26, 15:03 UTC1h 42m
2026-07-26 SKW238P PHX → OKC Jul 26, 02:20 UTCJul 26, 04:10 UTC1h 50m
2026-07-25 SKW6354 ORD → PVD Jul 25, 23:40 UTCJul 26, 01:15 UTC1h 35m
2026-07-25 SKW6354 ORD → PVD Jul 25, 20:55 UTCJul 25, 22:25 UTC1h 30m
2026-07-25 SKW4986 ORD → ICT Jul 25, 18:55 UTCJul 25, 19:20 UTC25m
2026-07-25 SKW4986 ORD → ICT Jul 25, 17:30 UTCJul 25, 17:50 UTC20m
2026-07-25 SKW6392 OKC → PHX Jul 25, 14:10 UTCJul 25, 16:00 UTC1h 50m
2026-07-25 SKW6206 PHX → SFO Jul 25, 12:40 UTCJul 25, 13:25 UTC45m
2026-07-25 SKW6206 PHX → SFO Jul 25, 12:39 UTCJul 25, 13:12 UTC33m
2026-07-25 SKW4897 ORD → CVG Jul 25, 10:20 UTCJul 25, 11:05 UTC45m
2026-07-25 SKW4933 DFW → CLL Jul 25, 02:51 UTCJul 25, 03:35 UTC44m
2026-07-25 SKW4933 DFW → CLL Jul 25, 02:55 UTCJul 25, 03:30 UTC35m
2026-07-24 SKW6384 MEM → ORD Jul 24, 23:10 UTCJul 25, 00:40 UTC1h 30m
2026-07-24 SKW6384 MEM → ORD Jul 24, 20:30 UTCJul 24, 22:00 UTC1h 30m
2026-07-24 SKW4918 - Jul 24, 17:40 UTCJul 24, 19:10 UTC1h 30m
2026-07-24 SKW4918 - Jul 24, 14:20 UTCJul 24, 15:50 UTC1h 30m
2026-07-24 SKW6233 STL → ORD Jul 24, 00:55 UTCJul 24, 02:55 UTC2h 0m
2026-07-23 SKW6233 STL → ORD Jul 23, 22:10 UTCJul 24, 00:00 UTC1h 50m
2026-07-23 SKW4963 SJC → LAX Jul 23, 19:15 UTCJul 23, 20:55 UTC1h 40m
2026-07-23 SKW4963 SJC → LAX Jul 23, 14:35 UTCJul 23, 15:55 UTC1h 20m
2026-07-23 SKW6302 ABQ → LAX Jul 23, 11:45 UTCJul 23, 12:30 UTC45m
2026-07-23 SKW6302 ABQ → LAX Jul 23, 11:36 UTCJul 23, 13:10 UTC1h 34m
2026-07-23 SKW4981 PHX → CID Jul 23, 02:30 UTCJul 23, 03:50 UTC1h 20m
2026-07-23 SKW6344 PHX → SJC Jul 23, 00:05 UTCJul 23, 00:40 UTC35m
2026-07-22 SKW6344 PHX → SJC Jul 22, 22:35 UTCJul 22, 23:05 UTC30m
2026-07-22 SKW6238 - Jul 22, 19:35 UTCJul 22, 20:50 UTC1h 15m
2026-07-22 SKW6238 - Jul 22, 17:40 UTCJul 22, 18:45 UTC1h 5m
2026-07-22 SKW6237 PHX → SJC Jul 22, 15:30 UTCJul 22, 16:05 UTC35m
2026-07-22 SKW6237 PHX → SJC Jul 22, 15:26 UTCJul 22, 16:00 UTC34m
2026-07-22 SKW6237 PHX → SJC Jul 22, 14:10 UTCJul 22, 14:30 UTC20m
2026-07-22 SKW4926 SWO → DFW Jul 22, 11:15 UTCJul 22, 12:00 UTC45m
2026-07-22 SKW4961 MLI → ORD Jul 22, 02:50 UTCJul 22, 03:30 UTC40m
2026-07-21 SKW4996 AUS → PHX Jul 21, 23:15 UTCJul 22, 01:00 UTC1h 45m
2026-07-21 SKW4996 AUS → PHX Jul 21, 20:35 UTCJul 21, 22:10 UTC1h 35m
2026-07-21 SKW4918 - Jul 21, 17:20 UTCJul 21, 18:50 UTC1h 30m
2026-07-21 SKW4918 - Jul 21, 14:15 UTCJul 21, 15:40 UTC1h 25m
2026-07-21 SKW6329 - Jul 21, 11:15 UTCJul 21, 12:05 UTC50m
2026-07-21 SKW6313 DFW → BPT Jul 21, 02:50 UTCJul 21, 03:35 UTC45m
2026-07-20 SKW4996 AUS → PHX Jul 20, 23:15 UTCJul 21, 00:55 UTC1h 39m
2026-07-20 SKW4996 AUS → PHX Jul 20, 23:00 UTCJul 21, 00:50 UTC1h 50m
2026-07-20 SKW4996 AUS → PHX Jul 20, 20:25 UTCJul 20, 21:55 UTC1h 30m
2026-07-20 SKW6217 - Jul 20, 17:55 UTCJul 20, 18:45 UTC50m
2026-07-20 SKW6217 LBB → DFW Jul 20, 17:53 UTCJul 20, 18:40 UTC47m
2026-07-20 SKW6217 - Jul 20, 16:05 UTCJul 20, 16:45 UTC40m
2026-07-20 SKW6414 - Jul 20, 12:50 UTCJul 20, 14:25 UTC1h 35m
2026-07-20 SKW6442 - Jul 20, 02:35 UTCJul 20, 04:05 UTC1h 30m

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 N715SK page for operator, model, and routing details .

Mode-S A9903A frequently asked

What is Mode-S code A9903A?
A9903A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N715SK.
Where is Mode-S A9903A registered?
Mode-S code A9903A 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 A9903A broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:30 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9903A, octal 52310072, decimal 11,112,506.
What flights does A9903A operate?
Mode-S A9903A has broadcast 20 distinct callsigns, including SKW4966, SKW6513, SKW6396, SKW5000, SKW6408.