Apparatus

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sensors Mode-S transponder

A3904C

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N329FR · AIRBUS A-320neo · operated by BANK OF UTAH TRUSTEE

Hex
A3904C
Octal
50710114
Decimal
10,719,308
Country
US
Tail
N329FR
Type
A20N
Transponder active on ground
Flights observed
195
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A3904C.

Country allocation

The ICAO 24-bit address A3904C 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
FFT1555 Frontier Airlines 4 2026-05-10
FFT689 Frontier Airlines 3 2026-04-17
FFT4685 Frontier Airlines 3 2026-05-09
FFT4420 Frontier Airlines 3 2026-05-06
FFT4092 Frontier Airlines 3 2026-04-13
FFT3231 Frontier Airlines 3 2026-04-15
FFT3053 Frontier Airlines 3 2026-04-27
FFT143 - 3 2026-04-13
FFT777 Frontier Airlines 2 2026-04-25
FFT688 Frontier Airlines 2 2026-04-16
FFT4966 Frontier Airlines 2 2026-04-29
FFT4855 Frontier Airlines 2 2026-04-16
FFT4793 Frontier Airlines 2 2026-04-25
FFT4639 Frontier Airlines 2 2026-04-17
FFT4496 Frontier Airlines 2 2026-05-17
FFT4419 Frontier Airlines 2 2026-05-06
FFT4406 Frontier Airlines 2 2026-04-19
FFT4113 Frontier Airlines 2 2026-05-01
FFT3930 Frontier Airlines 2 2026-04-17
FFT3923 Frontier Airlines 2 2026-05-17

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-30 FFT2523 SLC → PHX May 30, 04:20 UTCMay 30, 05:35 UTC1h 15m
2026-05-30 FFT1504 SFO → SLC May 30, 01:55 UTCMay 30, 03:20 UTC1h 25m
2026-05-29 FFT1191 PHX → SFO May 29, 22:50 UTCMay 30, 00:40 UTC1h 50m
2026-05-20 FFT1572 SAN → PHX May 20, 23:45 UTCMay 21, 00:40 UTC55m
2026-05-20 FFT1572 SAN → PHX May 20, 23:30 UTCMay 21, 00:40 UTC1h 10m
2026-05-20 FFT1571 PHX → SAN May 20, 21:45 UTCMay 20, 22:35 UTC50m
2026-05-20 FFT3871 SLC → PHX May 20, 18:50 UTCMay 20, 20:05 UTC1h 15m
2026-05-20 FFT3871 SLC → PHX May 20, 18:46 UTCMay 20, 20:05 UTC1h 19m
2026-05-20 FFT1440 PHX → SLC May 20, 16:18 UTCMay 20, 17:38 UTC1h 20m
2026-05-20 FFT1440 PHX → SLC May 20, 16:25 UTCMay 20, 17:45 UTC1h 20m
2026-05-20 FFT4753 DEN → PHX May 20, 04:50 UTCMay 20, 06:20 UTC1h 30m
2026-05-19 FFT4343 XNA → DEN May 19, 19:40 UTCMay 19, 21:05 UTC1h 25m
2026-05-19 FFT4344 DEN → XNA May 19, 17:10 UTCMay 19, 18:30 UTC1h 20m
2026-05-19 FFT1323 DFW → DEN May 19, 14:19 UTCMay 19, 15:57 UTC1h 38m
2026-05-19 FFT1323 DFW → DEN May 19, 14:25 UTCMay 19, 16:05 UTC1h 40m
2026-05-19 FFT2632 DEN → DFW May 19, 04:40 UTCMay 19, 06:10 UTC1h 30m
2026-05-19 FFT2631 DFW → DEN May 19, 01:10 UTCMay 19, 03:15 UTC2h 5m
2026-05-18 FFT1052 LAS → DFW May 18, 21:20 UTCMay 18, 23:35 UTC2h 15m
2026-05-18 FFT1052 LAS → DFW May 18, 21:08 UTCMay 18, 23:33 UTC2h 25m
2026-05-18 FFT1051 DFW → LAS May 18, 17:00 UTCMay 18, 19:35 UTC2h 34m
2026-05-18 FFT3886 LAS → DFW May 18, 13:05 UTCMay 18, 15:15 UTC2h 10m
2026-05-18 FFT4495 TTN → TPA May 18, 01:00 UTCMay 18, 05:20 UTC4h 20m
2026-05-17 FFT4496 LAS → MEM May 17, 21:05 UTCMay 17, 23:50 UTC2h 45m
2026-05-17 FFT4496 LAS → MEM May 17, 20:55 UTCMay 17, 23:51 UTC2h 56m
2026-05-17 FFT2232 ONT → LAS May 17, 19:01 UTCMay 17, 19:45 UTC45m
2026-05-17 FFT2678 SFO → ONT May 17, 16:30 UTCMay 17, 17:01 UTC30m
2026-05-17 FFT2678 SFO → ONT May 17, 16:32 UTCMay 17, 17:25 UTC53m
2026-05-17 FFT3019 LAS → SFO May 17, 13:55 UTCMay 17, 15:05 UTC1h 10m
2026-05-17 FFT3923 ATL → LAS May 17, 00:40 UTCMay 17, 04:25 UTC3h 45m
2026-05-16 FFT3046 MSP → ATL May 16, 19:35 UTCMay 16, 22:00 UTC2h 25m
2026-05-16 FFT3045 ATL → MSP May 16, 16:00 UTCMay 16, 18:15 UTC2h 15m
2026-05-16 FFT2292 MDW → ATL May 16, 11:11 UTCMay 16, 12:45 UTC1h 35m
2026-05-16 FFT2779 PHX → SNA May 16, 01:15 UTCMay 16, 02:45 UTC1h 30m
2026-05-15 FFT2171 LAS → PDX May 15, 22:00 UTCMay 15, 23:30 UTC1h 30m
2026-05-15 FFT3014 ATL → TPA May 15, 19:10 UTCMay 15, 20:35 UTC1h 25m
2026-05-15 FFT1116 LAS → ATL May 15, 13:50 UTCMay 15, 17:15 UTC3h 24m
2026-05-15 FFT2264 LAX → LAS May 15, 05:50 UTCMay 15, 06:40 UTC50m
2026-05-15 FFT2264 LAX → LAS May 15, 05:41 UTCMay 15, 06:26 UTC45m
2026-05-15 FFT2858 SFO → LAX May 15, 03:45 UTCMay 15, 04:40 UTC55m
2026-05-15 FFT4593 LAX → SFO May 15, 01:40 UTCMay 15, 02:40 UTC1h 0m
2026-05-14 FFT1183 PVD → MCO May 14, 21:50 UTCMay 14, 22:35 UTC45m
2026-05-14 FFT1183 PVD → MCO May 14, 21:43 UTCMay 14, 22:32 UTC49m
2026-05-14 FFT3292 LAX → LAS May 14, 19:30 UTCMay 14, 20:15 UTC45m
2026-05-14 FFT1267 SLC → LAX May 14, 16:25 UTCMay 14, 17:50 UTC1h 25m
2026-05-14 FFT1508 LAS → SLC May 14, 14:05 UTCMay 14, 15:10 UTC1h 5m
2026-05-13 FFT1765 FAR → DEN May 13, 01:10 UTCMay 13, 02:40 UTC1h 30m
2026-05-12 FFT4236 SLC → DEN May 12, 22:50 UTCMay 12, 23:50 UTC1h 0m
2026-05-12 FFT3219 PHL → FLL May 12, 20:15 UTCMay 12, 21:20 UTC1h 5m
2026-05-12 FFT1733 CVG → PHX May 12, 10:05 UTCMay 12, 13:40 UTC3h 35m
2026-05-12 FFT2050 ATL → MCO May 12, 05:15 UTCMay 12, 06:20 UTC1h 5m

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 N329FR page for operator, model, and routing details .

Mode-S A3904C frequently asked

What is Mode-S code A3904C?
A3904C is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N329FR.
Where is Mode-S A3904C registered?
Mode-S code A3904C 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 A3904C broadcasting right now?
Mode-S A3904C is currently broadcasting from the ground.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3904C, octal 50710114, decimal 10,719,308.
What flights does A3904C operate?
Mode-S A3904C has broadcast 20 distinct callsigns, including FFT1555, FFT689, FFT4685, FFT4420, FFT4092.