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sensors Mode-S transponder

AAB99F

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N790SK · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
AAB99F
Octal
52534637
Decimal
11,188,639
Country
US
Tail
N790SK
Type
CRJ7
No current signal · last broadcast Jul 26, 20:15 UTC
Flights observed
578
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:15 UTC

Last known position

Most recent position reported by Mode-S AAB99F.

Country allocation

The ICAO 24-bit address AAB99F 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
SKW5661 - 9 2026-07-18
SKW5609 SkyWest Airlines 8 2026-06-15
SKW5055 SkyWest Airlines 8 2026-06-14
SKW4684 SkyWest Airlines 8 2026-07-26
SKW5825 - 7 2026-06-17
SKW5556 - 7 2026-07-17
SKW5495 SkyWest Airlines 7 2026-07-26
SKW5239 SkyWest Airlines 7 2026-07-25
SKW5348 SkyWest Airlines 6 2026-07-23
SKW5221 - 6 2026-07-19
SKW5045 SkyWest Airlines 6 2026-05-18
SKW4731 SkyWest Airlines 6 2026-07-18
SKW5827 - 5 2026-07-14
SKW5805 SkyWest Airlines 5 2026-07-17
SKW5794 SkyWest Airlines 5 2026-07-21
SKW5649 - 5 2026-06-22
SKW5535 SkyWest Airlines 5 2026-04-24
SKW5431 - 5 2026-07-14
SKW5257 - 5 2026-06-25
SKW5252 - 5 2026-07-21

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW5229 SFO → TUS Jul 26, 18:45 UTCJul 26, 20:05 UTC1h 20m
2026-07-26 SKW5235 IAH → GDL Jul 26, 16:00 UTCJul 26, 16:45 UTC45m
2026-07-26 SKW5495 ORD → MKE Jul 26, 13:20 UTCJul 26, 14:15 UTC55m
2026-07-26 SKW4684 DEN → SAF Jul 26, 01:45 UTCJul 26, 02:25 UTC40m
2026-07-26 SKW4684 DEN → SAF Jul 26, 01:44 UTCJul 26, 02:26 UTC42m
2026-07-25 SKW4634 FAR → ORD Jul 25, 23:00 UTCJul 26, 00:40 UTC1h 40m
2026-07-25 SKW4629 BOI → SFO Jul 25, 20:05 UTCJul 25, 21:30 UTC1h 25m
2026-07-25 SKW5239 ORD → FSD Jul 25, 11:15 UTCJul 25, 11:45 UTC30m
2026-07-25 SKW5239 ORD → FSD Jul 25, 11:09 UTCJul 25, 12:38 UTC1h 29m
2026-07-25 SKW5964 FCA → SFO Jul 25, 03:05 UTCJul 25, 04:35 UTC1h 30m
2026-07-24 SKW5695 MFR → SFO Jul 24, 20:00 UTCJul 25, 01:30 UTC5h 30m
2026-07-24 SKW424M DEN → DEN Jul 24, 14:15 UTCJul 24, 18:05 UTC3h 50m
2026-07-24 SKW5906 BNA → ORD Jul 24, 04:09 UTCJul 24, 05:19 UTC1h 10m
2026-07-24 SKW5547 SFO → ABQ Jul 24, 01:20 UTCJul 24, 01:55 UTC35m
2026-07-23 SKW5528 LAX → ACV Jul 23, 20:50 UTCJul 23, 23:00 UTC2h 10m
2026-07-23 SKW5528 LAX → ACV Jul 23, 18:10 UTCJul 23, 23:10 UTC5h 0m
2026-07-23 SKW5348 FAR → ORD Jul 23, 14:55 UTCJul 23, 16:10 UTC1h 15m
2026-07-23 SKW5348 FAR → ORD Jul 23, 15:00 UTCJul 23, 16:01 UTC1h 1m
2026-07-23 SKW5622 SFO → MSP Jul 23, 00:20 UTCJul 23, 01:25 UTC1h 5m
2026-07-22 SKW5462 FAR → DEN Jul 22, 19:30 UTCJul 22, 21:05 UTC1h 35m
2026-07-22 SKW5210 FSD → FAR Jul 22, 16:40 UTCJul 22, 18:15 UTC1h 35m
2026-07-22 SKW5210 FSD → FAR Jul 22, 16:28 UTCJul 22, 17:56 UTC1h 28m
2026-07-21 SKW5975 DEN → FSD Jul 21, 13:50 UTCJul 21, 15:00 UTC1h 10m
2026-07-21 SKW5794 AVL → ORD Jul 21, 11:20 UTCJul 21, 12:40 UTC1h 20m
2026-07-21 SKW5252 - Jul 21, 01:25 UTCJul 21, 02:45 UTC1h 20m
2026-07-20 SKW4719 COS → DEN Jul 20, 23:30 UTCJul 20, 23:55 UTC24m
2026-07-20 SKW5546 LEX → ORD Jul 20, 22:05 UTCJul 20, 22:25 UTC20m
2026-07-20 SKW5229 DEN → DEN Jul 20, 16:10 UTCJul 20, 20:45 UTC4h 35m
2026-07-20 SKW4696 COS → DEN Jul 20, 13:20 UTCJul 20, 13:45 UTC25m
2026-07-20 SKW5669 MAF → IAH Jul 20, 02:20 UTCJul 20, 02:35 UTC15m
2026-07-20 SKW5669 MAF → IAH Jul 20, 02:15 UTCJul 20, 02:32 UTC17m
2026-07-19 SKW5472 ORD → CHA Jul 19, 22:30 UTCJul 19, 23:55 UTC1h 25m
2026-07-19 SKW394Y DEN → MAF Jul 19, 20:00 UTCJul 19, 21:15 UTC1h 15m
2026-07-19 SKW4709 - Jul 19, 17:40 UTCJul 19, 18:15 UTC35m
2026-07-19 SKW4704 DEN → GJT Jul 19, 16:05 UTCJul 19, 16:25 UTC20m
2026-07-19 SKW5221 - Jul 19, 13:20 UTCJul 19, 14:05 UTC45m
2026-07-18 SKW5233 SFO → BUR Jul 18, 20:50 UTCJul 18, 21:35 UTC45m
2026-07-18 SKW5661 - Jul 18, 16:40 UTCJul 18, 17:35 UTC55m
2026-07-18 SKW4731 DEN → SAF Jul 18, 14:35 UTCJul 18, 15:15 UTC40m
2026-07-18 SKW5237 DEN → DEN Jul 18, 00:25 UTCJul 18, 12:10 UTC11h 46m
2026-07-17 SKW5805 SNA → SFO Jul 17, 22:10 UTCJul 17, 22:40 UTC30m
2026-07-17 SKW5805 SNA → SFO Jul 17, 21:50 UTCJul 17, 22:37 UTC47m
2026-07-17 SKW5556 DEN → RAP Jul 17, 20:08 UTCJul 17, 20:48 UTC40m
2026-07-17 SKW5556 - Jul 17, 20:04 UTCJul 17, 20:35 UTC30m
2026-07-17 SKW5685 XWA → DEN Jul 17, 16:49 UTCJul 17, 18:30 UTC1h 41m
2026-07-17 SKW5685 - Jul 17, 14:15 UTCJul 17, 18:34 UTC4h 20m
2026-07-17 SKW5794 - Jul 17, 11:25 UTCJul 17, 12:50 UTC1h 25m
2026-07-17 SKW5794 MAF → DEN Jul 17, 11:16 UTCJul 17, 12:35 UTC1h 19m
2026-07-17 SKW5252 - Jul 17, 01:15 UTCJul 17, 02:30 UTC1h 15m
2026-07-16 SKW5666 - Jul 16, 22:35 UTCJul 16, 23:35 UTC1h 0m

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 N790SK page for operator, model, and routing details .

Mode-S AAB99F frequently asked

What is Mode-S code AAB99F?
AAB99F is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N790SK.
Where is Mode-S AAB99F registered?
Mode-S code AAB99F 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 AAB99F broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAB99F, octal 52534637, decimal 11,188,639.
What flights does AAB99F operate?
Mode-S AAB99F has broadcast 20 distinct callsigns, including SKW5661, SKW5609, SKW5055, SKW4684, SKW5825.