Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A33AFA

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N307SY · EMBRAER ERJ-170-200 (long wing) · operated by SKYWEST AIRLINES INC

Hex
A33AFA
Octal
50635372
Decimal
10,697,466
Country
US
Tail
N307SY
Type
E75L
No current signal · last broadcast Jul 26, 22:00 UTC
Flights observed
696
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:00 UTC

Last known position

Most recent position reported by Mode-S A33AFA.

Country allocation

The ICAO 24-bit address A33AFA 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
SKW3991 - 13 2026-06-28
SKW4451 SkyWest Airlines 9 2026-07-23
SKW4063 SkyWest Airlines 9 2026-05-16
SKW4043 SkyWest Airlines 9 2026-07-21
SKW3989 SkyWest Airlines 9 2026-05-23
SKW168F SkyWest Airlines 9 2026-07-20
SKW3966 - 8 2026-06-28
SKW3824 SkyWest Airlines 8 2026-07-19
SKW4035 SkyWest Airlines 7 2026-05-26
SKW3987 - 7 2026-07-19
SKW3916 - 7 2026-07-12
SKW3891 - 7 2026-07-19
SKW3789 SkyWest Airlines 7 2026-07-20
SKW3688 SkyWest Airlines 7 2026-07-25
SKW4449 SkyWest Airlines 6 2026-05-17
SKW4165 - 6 2026-07-16
SKW4104 SkyWest Airlines 6 2026-07-21
SKW3937 - 6 2026-07-18
SKW3923 - 6 2026-07-16
SKW3818 SkyWest Airlines 6 2026-07-05

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3679 DTW → MDW Jul 26, 19:05 UTCJul 26, 21:55 UTC2h 50m
2026-07-26 SKW138Y LAX → TUS Jul 26, 16:40 UTCJul 26, 17:45 UTC1h 5m
2026-07-26 SKW4106 RNO → LAX Jul 26, 14:20 UTCJul 26, 15:30 UTC1h 10m
2026-07-26 SKW3929 SJC → SLC Jul 26, 05:35 UTCJul 26, 06:30 UTC55m
2026-07-26 SKW4087 SAN → LAX Jul 26, 04:20 UTCJul 26, 04:45 UTC25m
2026-07-26 SKW4087 SAN → LAX Jul 26, 02:35 UTCJul 26, 03:05 UTC30m
2026-07-25 SKW3701 BOS → CLE Jul 25, 23:45 UTCJul 26, 00:50 UTC1h 5m
2026-07-25 SKW3701 BOS → CLE Jul 25, 22:55 UTCJul 25, 23:10 UTC15m
2026-07-25 SKW3959 MSP → BIS Jul 25, 20:50 UTCJul 25, 21:50 UTC1h 0m
2026-07-25 SKW183T BOI → SEA Jul 25, 18:30 UTCJul 25, 19:35 UTC1h 5m
2026-07-25 SKW183T BOI → SEA Jul 25, 18:29 UTCJul 25, 19:34 UTC1h 5m
2026-07-25 SKW3678 BOS → CLE Jul 25, 16:15 UTCJul 25, 17:20 UTC1h 5m
2026-07-25 SKW4471 PDX → SEA Jul 25, 14:20 UTCJul 25, 14:50 UTC30m
2026-07-25 SKW3913 MQT → DTW Jul 25, 04:30 UTCJul 25, 05:00 UTC30m
2026-07-25 SKW3688 DTW → CMH Jul 25, 01:55 UTCJul 25, 03:00 UTC1h 5m
2026-07-24 SKW3688 DTW → CMH Jul 24, 23:55 UTCJul 25, 01:00 UTC1h 5m
2026-07-24 SKW3679 DTW → MDW Jul 24, 19:25 UTCJul 24, 22:05 UTC2h 40m
2026-07-24 SKW3679 DTW → MDW Jul 24, 19:23 UTCJul 24, 21:55 UTC2h 32m
2026-07-24 SKW138Y LAX → TUS Jul 24, 16:40 UTCJul 24, 17:50 UTC1h 10m
2026-07-24 SKW4057 EWR → BOS Jul 24, 13:20 UTCJul 24, 14:20 UTC1h 0m
2026-07-24 SKW4057 EWR → BOS Jul 24, 13:13 UTCJul 24, 14:15 UTC1h 2m
2026-07-24 SKW3827 SHV → ATL Jul 24, 06:05 UTCJul 24, 07:10 UTC1h 5m
2026-07-24 SKW4077 LAX → PHX Jul 24, 03:25 UTCJul 24, 04:25 UTC1h 0m
2026-07-24 SKW4077 LAX → PHX Jul 24, 00:55 UTCJul 24, 02:00 UTC1h 5m
2026-07-23 SKW3812 SLC → OAK Jul 23, 21:28 UTCJul 23, 22:32 UTC1h 4m
2026-07-23 SKW3812 SLC → OAK Jul 23, 21:30 UTCJul 23, 22:35 UTC1h 5m
2026-07-23 SKW134F LAX → SMF Jul 23, 19:15 UTCJul 23, 20:15 UTC1h 0m
2026-07-23 SKW134F LAX → SMF Jul 23, 19:20 UTCJul 23, 20:08 UTC48m
2026-07-23 SKW4451 SEA → SFO Jul 23, 17:15 UTCJul 23, 18:15 UTC1h 0m
2026-07-23 SKW4026 MSP → ATW Jul 23, 14:20 UTCJul 23, 15:50 UTC1h 30m
2026-07-23 SKW4009 SEA → SFO Jul 23, 02:00 UTCJul 23, 03:50 UTC1h 50m
2026-07-22 SKW3585 JFK → ORD Jul 22, 22:30 UTCJul 23, 00:25 UTC1h 55m
2026-07-22 SKW4112 MSO → SLC Jul 22, 19:33 UTCJul 22, 20:36 UTC1h 3m
2026-07-22 SKW4112 - Jul 22, 17:20 UTCJul 22, 20:50 UTC3h 30m
2026-07-22 SKW3796 SFO → SEA Jul 22, 13:10 UTCJul 22, 15:30 UTC2h 20m
2026-07-22 SKW3796 SFO → SEA Jul 22, 12:57 UTCJul 22, 15:28 UTC2h 31m
2026-07-22 SKW3620 SLC → XNA Jul 22, 00:10 UTCJul 22, 02:30 UTC2h 20m
2026-07-21 SKW4104 ORD → JFK Jul 21, 19:10 UTCJul 21, 23:00 UTC3h 50m
2026-07-21 SKW3953 JFK → ORD Jul 21, 17:30 UTCJul 21, 17:55 UTC25m
2026-07-21 SKW3953 JFK → ORD Jul 21, 14:50 UTCJul 21, 15:25 UTC35m
2026-07-21 SKW3953 JFK → ORD Jul 21, 14:43 UTCJul 21, 15:20 UTC37m
2026-07-21 SKW3972 - Jul 21, 12:45 UTCJul 21, 13:20 UTC35m
2026-07-21 SKW4017 BIS → MSP Jul 21, 06:25 UTCJul 21, 07:00 UTC35m
2026-07-21 SKW4017 BIS → MSP Jul 21, 06:23 UTCJul 21, 06:58 UTC35m
2026-07-21 SKW4043 HPN → ATL Jul 21, 04:00 UTCJul 21, 05:20 UTC1h 20m
2026-07-21 SKW4043 HPN → ATL Jul 21, 01:05 UTCJul 21, 02:35 UTC1h 30m
2026-07-20 SKW3789 SJC → SEA Jul 20, 22:15 UTCJul 21, 00:05 UTC1h 49m
2026-07-20 SKW3789 SJC → SEA Jul 20, 22:04 UTCJul 20, 23:50 UTC1h 46m
2026-07-20 SKW168F SEA → SJC Jul 20, 19:15 UTCJul 20, 21:10 UTC1h 55m
2026-07-20 SKW156H GEG → SEA Jul 20, 16:39 UTCJul 20, 17:25 UTC46m

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 N307SY page for operator, model, and routing details .

Mode-S A33AFA frequently asked

What is Mode-S code A33AFA?
A33AFA is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N307SY.
Where is Mode-S A33AFA registered?
Mode-S code A33AFA 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 A33AFA broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:00 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A33AFA, octal 50635372, decimal 10,697,466.
What flights does A33AFA operate?
Mode-S A33AFA has broadcast 20 distinct callsigns, including SKW3991, SKW4451, SKW4063, SKW4043, SKW3989.