Apparatus

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sensors Mode-S transponder

A6F9FA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N549GJ · BOMBARDIER Regional Jet CRJ-700 · operated by SKYWEST AIRLINES INC

Hex
A6F9FA
Octal
51574772
Decimal
10,942,970
Country
US
Tail
N549GJ
Type
CRJ7
No current signal · last broadcast Jul 26, 21:40 UTC
Flights observed
739
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:40 UTC

Last known position

Most recent position reported by Mode-S A6F9FA.

Country allocation

The ICAO 24-bit address A6F9FA 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
GJS4441 - 10 2026-07-09
GJS4170 GoJet Airlines 10 2026-07-11
GJS4591 - 9 2026-07-14
GJS4444 GoJet Airlines 9 2026-07-19
GJS4482 GoJet Airlines 8 2026-05-28
GJS4460 - 8 2026-07-11
GJS4399 - 8 2026-07-02
GJS4392 GoJet Airlines 8 2026-07-08
GJS4390 - 8 2026-06-24
GJS4599 - 7 2026-07-20
GJS4549 - 7 2026-06-22
GJS4449 GoJet Airlines 7 2026-06-09
GJS4405 - 7 2026-07-02
GJS4191 GoJet Airlines 7 2026-07-23
GJS4604 - 6 2026-06-24
GJS4603 GoJet Airlines 6 2026-06-12
GJS4587 - 6 2026-07-20
GJS4573 GoJet Airlines 6 2026-07-25
GJS4556 - 6 2026-07-16
GJS4548 - 6 2026-07-07

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 GJS4452 RIC → EWR Jul 26, 20:35 UTCJul 26, 21:30 UTC55m
2026-07-26 GJS4581 ORD → GSP Jul 26, 18:35 UTCJul 26, 19:15 UTC40m
2026-07-26 GJS4185 ORD → STL Jul 26, 15:15 UTCJul 26, 17:00 UTC1h 45m
2026-07-25 GJS4173 DCA → EWR Jul 25, 22:00 UTCJul 25, 23:15 UTC1h 15m
2026-07-25 GJS4383 STL → ORD Jul 25, 19:50 UTCJul 25, 20:35 UTC45m
2026-07-25 GJS4383 STL → ORD Jul 25, 19:51 UTCJul 25, 20:20 UTC29m
2026-07-25 GJS4475 RIC → EWR Jul 25, 18:20 UTCJul 25, 18:55 UTC35m
2026-07-25 GJS4517 DCA → EWR Jul 25, 15:45 UTCJul 25, 16:40 UTC55m
2026-07-25 GJS4573 LEX → ORD Jul 25, 03:20 UTCJul 25, 03:35 UTC15m
2026-07-25 GJS4573 LEX → ORD Jul 25, 00:10 UTCJul 25, 01:55 UTC1h 45m
2026-07-24 GJS4574 ORD → YOW Jul 24, 21:30 UTCJul 24, 22:50 UTC1h 20m
2026-07-24 GJS4436 IAD → PWM Jul 24, 19:10 UTCJul 24, 20:15 UTC1h 5m
2026-07-24 GJS4470 - Jul 24, 14:25 UTCJul 24, 15:20 UTC55m
2026-07-24 GJS4468 EWR → CLT Jul 24, 02:30 UTCJul 24, 03:55 UTC1h 25m
2026-07-23 GJS4434 DCA → EWR Jul 23, 23:15 UTCJul 24, 00:35 UTC1h 20m
2026-07-23 GJS4419 GSO → EWR Jul 23, 19:10 UTCJul 23, 20:55 UTC1h 45m
2026-07-23 GJS4607 TVC → ORD Jul 23, 15:45 UTCJul 23, 17:15 UTC1h 30m
2026-07-23 GJS4191 RIC → EWR Jul 23, 12:30 UTCJul 23, 14:25 UTC1h 55m
2026-07-23 GJS4580 IAD → ACK Jul 23, 10:10 UTCJul 23, 11:15 UTC1h 5m
2026-07-23 GJS4580 IAD → ACK Jul 23, 10:16 UTCJul 23, 11:13 UTC57m
2026-07-23 GJS4520 - Jul 23, 03:05 UTCJul 23, 04:15 UTC1h 10m
2026-07-23 GJS4520 EWR → GSO Jul 23, 02:56 UTCJul 23, 04:20 UTC1h 24m
2026-07-23 GJS4514 - Jul 23, 00:25 UTCJul 23, 01:35 UTC1h 10m
2026-07-22 GJS4509 EWR → GSO Jul 22, 22:08 UTCJul 22, 23:48 UTC1h 40m
2026-07-22 GJS4509 EWR → GSO Jul 22, 21:50 UTCJul 22, 23:20 UTC1h 30m
2026-07-22 GJS3376 DCA → EWR Jul 22, 15:05 UTCJul 22, 16:20 UTC1h 15m
2026-07-22 GJS3376 DCA → EWR Jul 22, 14:02 UTCJul 22, 16:03 UTC2h 1m
2026-07-21 GJS3376 - Jul 21, 14:45 UTCJul 21, 15:10 UTC25m
2026-07-21 GJS4473 IAD → RIC Jul 21, 02:25 UTCJul 21, 03:05 UTC40m
2026-07-20 GJS4593 EWR → STL Jul 20, 23:45 UTCJul 21, 00:45 UTC1h 0m
2026-07-20 GJS4588 EWR → RIC Jul 20, 21:35 UTCJul 20, 22:35 UTC1h 0m
2026-07-20 GJS4588 EWR → RIC Jul 20, 21:48 UTCJul 20, 22:32 UTC44m
2026-07-20 GJS4387 - Jul 20, 19:25 UTCJul 20, 20:25 UTC1h 0m
2026-07-20 GJS4387 CMH → IAD Jul 20, 19:09 UTCJul 20, 20:15 UTC1h 6m
2026-07-20 GJS4420 IAD → LGA Jul 20, 17:25 UTCJul 20, 18:10 UTC45m
2026-07-20 GJS4609 - Jul 20, 15:05 UTCJul 20, 16:10 UTC1h 5m
2026-07-20 GJS4599 IAD → PVD Jul 20, 12:50 UTCJul 20, 14:05 UTC1h 15m
2026-07-20 GJS4578 ROC → IAD Jul 20, 10:10 UTCJul 20, 11:10 UTC1h 0m
2026-07-20 GJS4394 EWR → DCA Jul 20, 03:05 UTCJul 20, 03:55 UTC50m
2026-07-20 GJS4587 PHL → IAD Jul 20, 00:05 UTCJul 20, 00:40 UTC35m
2026-07-19 GJS4534 - Jul 19, 22:00 UTCJul 19, 22:30 UTC30m
2026-07-19 GJS4534 IAD → PHL Jul 19, 21:58 UTCJul 19, 22:43 UTC45m
2026-07-19 GJS4387 - Jul 19, 19:40 UTCJul 19, 20:40 UTC1h 0m
2026-07-19 GJS4420 IAD → LGA Jul 19, 17:40 UTCJul 19, 18:45 UTC1h 5m
2026-07-19 GJS4575 - Jul 19, 15:55 UTCJul 19, 16:55 UTC1h 0m
2026-07-19 GJS4444 EWR → DCA Jul 19, 14:10 UTCJul 19, 14:50 UTC40m
2026-07-19 GJS4444 EWR → DCA Jul 19, 13:50 UTCJul 19, 14:05 UTC15m
2026-07-19 GJS4444 EWR → DCA Jul 19, 13:10 UTCJul 19, 13:20 UTC10m
2026-07-19 GJS4444 EWR → DCA Jul 19, 12:46 UTCJul 19, 14:47 UTC2h 1m
2026-07-17 GJS4545 - Jul 17, 19:05 UTCJul 17, 20:25 UTC1h 20m

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 N549GJ page for operator, model, and routing details .

Mode-S A6F9FA frequently asked

What is Mode-S code A6F9FA?
A6F9FA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N549GJ.
Where is Mode-S A6F9FA registered?
Mode-S code A6F9FA 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 A6F9FA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:40 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A6F9FA, octal 51574772, decimal 10,942,970.
What flights does A6F9FA operate?
Mode-S A6F9FA has broadcast 20 distinct callsigns, including GJS4441, GJS4170, GJS4591, GJS4444, GJS4482.