Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A34878

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N310SY · operated by SKYWEST AIRLINES INC

Hex
A34878
Octal
50644170
Decimal
10,700,920
Country
US
Tail
N310SY
Type
E75L
Broadcasting now · callsign SKW4009 · 35,000 ft
Flights observed
745
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:10 UTC

Current position

A34878 is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A34878 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
SKW3999 SkyWest Airlines 16 2026-07-24
SKW3951 - 11 2026-07-09
SKW3759 - 11 2026-07-10
SKW4087 SkyWest Airlines 10 2026-07-22
SKW3929 SkyWest Airlines 10 2026-07-22
SKW3841 - 10 2026-07-12
SKW3822 - 10 2026-07-09
SKW3818 SkyWest Airlines 9 2026-06-22
SKW3802 - 9 2026-07-19
SKW3688 SkyWest Airlines 9 2026-07-23
SKW3679 - 9 2026-07-22
SKW4106 SkyWest Airlines 8 2026-07-22
SKW4099 - 8 2026-06-18
SKW3902 - 8 2026-06-17
SKW3828 - 8 2026-07-13
SKW3755 SkyWest Airlines 8 2026-07-18
SKW3754 - 8 2026-06-25
SKW3750 - 8 2026-07-02
SKW3712 - 8 2026-07-14
SKW138Y SkyWest Airlines 8 2026-07-22

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SKW3804 ROC → DTW Jul 26, 19:50 UTCJul 26, 21:10 UTC1h 20m
2026-07-26 SKW3804 ROC → DTW Jul 26, 17:00 UTCJul 26, 18:05 UTC1h 5m
2026-07-26 SKW3745 TUS → SLC Jul 26, 14:05 UTCJul 26, 15:40 UTC1h 35m
2026-07-26 SKW3745 TUS → SLC Jul 26, 14:11 UTCJul 26, 15:37 UTC1h 26m
2026-07-26 SKW4054 SLC → OAK Jul 26, 03:15 UTCJul 26, 04:45 UTC1h 30m
2026-07-26 SKW144J SEA → SJC Jul 26, 00:20 UTCJul 26, 01:50 UTC1h 30m
2026-07-25 SKW108R SLC → LGB Jul 25, 21:35 UTCJul 25, 23:15 UTC1h 40m
2026-07-25 SKW108R SLC → LGB Jul 25, 21:24 UTCJul 25, 23:01 UTC1h 37m
2026-07-25 SKW4038 SEA → SJC Jul 25, 19:25 UTCJul 25, 20:25 UTC1h 0m
2026-07-25 SKW4038 SEA → SJC Jul 25, 19:26 UTCJul 25, 20:24 UTC58m
2026-07-25 SKW102P SGU → SLC Jul 25, 16:20 UTCJul 25, 17:15 UTC55m
2026-07-25 SKW3796 SFO → SEA Jul 25, 12:55 UTCJul 25, 15:15 UTC2h 20m
2026-07-25 SKW3620 SLC → XNA Jul 25, 00:20 UTCJul 25, 02:25 UTC2h 5m
2026-07-25 SKW3620 SLC → XNA Jul 25, 00:23 UTCJul 25, 02:22 UTC1h 59m
2026-07-24 SKW3801 JFK → IAD Jul 24, 22:05 UTCJul 24, 23:30 UTC1h 25m
2026-07-24 SKW3801 JFK → IAD Jul 24, 21:55 UTCJul 24, 23:25 UTC1h 30m
2026-07-24 SKW3779 OAK → SLC Jul 24, 19:50 UTCJul 24, 21:05 UTC1h 15m
2026-07-24 SKW156H GEG → SEA Jul 24, 17:35 UTCJul 24, 18:25 UTC50m
2026-07-24 SKW3830 OAK → LAX Jul 24, 15:40 UTCJul 24, 16:25 UTC45m
2026-07-24 SKW3830 OAK → LAX Jul 24, 15:24 UTCJul 24, 16:14 UTC50m
2026-07-24 SKW118R BOI → SEA Jul 24, 13:15 UTCJul 24, 14:25 UTC1h 10m
2026-07-24 SKW4090 MOT → MSP Jul 24, 04:45 UTCJul 24, 05:45 UTC1h 0m
2026-07-24 SKW3999 MSN → DTW Jul 24, 00:55 UTCJul 24, 03:10 UTC2h 15m
2026-07-23 SKW3999 MSN → DTW Jul 23, 21:30 UTCJul 24, 00:10 UTC2h 40m
2026-07-23 SKW183T BOI → SEA Jul 23, 18:50 UTCJul 23, 20:00 UTC1h 10m
2026-07-23 SKW3678 BOS → CLE Jul 23, 16:40 UTCJul 23, 17:40 UTC1h 0m
2026-07-23 SKW4471 PDX → SEA Jul 23, 14:45 UTCJul 23, 15:20 UTC35m
2026-07-23 SKW4471 PDX → SEA Jul 23, 14:18 UTCJul 23, 15:19 UTC1h 1m
2026-07-23 SKW3913 MQT → DTW Jul 23, 04:20 UTCJul 23, 05:00 UTC40m
2026-07-23 SKW3688 DTW → CMH Jul 23, 01:50 UTCJul 23, 02:55 UTC1h 5m
2026-07-22 SKW3688 DTW → CMH Jul 22, 23:55 UTCJul 23, 00:55 UTC1h 0m
2026-07-22 SKW3679 - Jul 22, 19:05 UTCJul 22, 21:40 UTC2h 35m
2026-07-22 SKW3679 TUS → SEA Jul 22, 19:01 UTCJul 22, 21:35 UTC2h 34m
2026-07-22 SKW138Y LAX → TUS Jul 22, 16:35 UTCJul 22, 17:45 UTC1h 10m
2026-07-22 SKW4106 RNO → LAX Jul 22, 14:25 UTCJul 22, 15:30 UTC1h 5m
2026-07-22 SKW3929 SJC → SLC Jul 22, 05:05 UTCJul 22, 05:25 UTC20m
2026-07-22 SKW4087 SAN → LAX Jul 22, 03:10 UTCJul 22, 03:40 UTC30m
2026-07-22 SKW4087 SAN → LAX Jul 22, 01:40 UTCJul 22, 02:10 UTC30m
2026-07-21 SKW3894 - Jul 21, 23:25 UTCJul 22, 00:25 UTC1h 0m
2026-07-21 SKW3894 - Jul 21, 21:20 UTCJul 21, 22:20 UTC1h 0m
2026-07-21 SKW4108 LAX → ABQ Jul 21, 18:35 UTCJul 21, 20:15 UTC1h 40m
2026-07-21 SKW4108 LAX → ABQ Jul 21, 18:37 UTCJul 21, 20:09 UTC1h 32m
2026-07-21 SKW4108 LAX → ABQ Jul 21, 15:30 UTCJul 21, 17:05 UTC1h 35m
2026-07-21 SKW3969 PIT → BOS Jul 21, 13:15 UTCJul 21, 14:25 UTC1h 10m
2026-07-21 SKW3969 PIT → BOS Jul 21, 13:15 UTCJul 21, 14:13 UTC58m
2026-07-21 SKW4083 MSP → MDW Jul 21, 04:50 UTCJul 21, 05:50 UTC1h 0m
2026-07-21 SKW4091 - Jul 21, 01:00 UTCJul 21, 02:35 UTC1h 35m
2026-07-20 SKW4091 - Jul 20, 22:10 UTCJul 20, 23:55 UTC1h 44m
2026-07-20 SKW3744 LAX → OAK Jul 20, 19:45 UTCJul 20, 20:50 UTC1h 5m
2026-07-20 SKW3680 IAD → MSP Jul 20, 15:40 UTCJul 20, 18:30 UTC2h 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 N310SY page for operator, model, and routing details .

Mode-S A34878 frequently asked

What is Mode-S code A34878?
A34878 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N310SY.
Where is Mode-S A34878 registered?
Mode-S code A34878 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 A34878 broadcasting right now?
Yes. Mode-S A34878 is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A34878, octal 50644170, decimal 10,700,920.
What flights does A34878 operate?
Mode-S A34878 has broadcast 20 distinct callsigns, including SKW3999, SKW3951, SKW3759, SKW4087, SKW3929.