Apparatus

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sensors Mode-S transponder

A39A13

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N331FR · AIRBUS A-320neo · operated by UMB BANK NA TRUSTEE

Hex
A39A13
Octal
50715023
Decimal
10,721,811
Country
US
Tail
N331FR
Type
A20N
Transponder active on ground
Flights observed
530
Distinct callsigns
20
Country
US
Last broadcast
Jul 25, 19:05 UTC

Last known position

Most recent position reported by Mode-S A39A13.

Country allocation

The ICAO 24-bit address A39A13 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
FFT4406 Frontier Airlines 9 2026-07-19
FFT685 Frontier Airlines 7 2026-06-10
FFT1699 Frontier Airlines 6 2026-07-23
FFT4964 Frontier Airlines 5 2026-06-11
FFT4306 - 5 2026-07-14
FFT4108 Frontier Airlines 5 2026-07-23
FFT2483 Frontier Airlines 5 2026-07-19
FFT2148 Frontier Airlines 5 2026-06-17
FFT690 Frontier Airlines 4 2026-06-09
FFT4107 Frontier Airlines 4 2026-07-23
FFT3889 - 4 2026-07-10
FFT3699 Frontier Airlines 4 2026-06-06
FFT3581 Frontier Airlines 4 2026-07-23
FFT3383 - 4 2026-07-14
FFT3211 Frontier Airlines 4 2026-06-11
FFT3037 - 4 2026-07-19
FFT2675 Frontier Airlines 4 2026-06-03
FFT2532 Frontier Airlines 4 2026-07-25
FFT2341 Frontier Airlines 4 2026-06-13
FFT2147 Frontier Airlines 4 2026-05-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-25 FFT3971 DFW → PHX Jul 25, 17:10 UTCJul 25, 19:00 UTC1h 50m
2026-07-25 FFT2532 PHX → DFW Jul 25, 13:37 UTCJul 25, 15:36 UTC1h 59m
2026-07-25 FFT2532 PHX → DFW Jul 25, 13:30 UTCJul 25, 15:40 UTC2h 10m
2026-07-25 FFT4753 DEN → PHX Jul 25, 04:40 UTCJul 25, 06:00 UTC1h 20m
2026-07-25 FFT4753 DEN → PHX Jul 25, 04:49 UTCJul 25, 05:58 UTC1h 9m
2026-07-25 FFT1820 PHX → DEN Jul 25, 01:55 UTCJul 25, 03:25 UTC1h 30m
2026-07-24 FFT4578 SAN → PHX Jul 24, 23:45 UTCJul 25, 00:45 UTC1h 0m
2026-07-24 FFT1571 PHX → SAN Jul 24, 21:25 UTCJul 24, 22:15 UTC50m
2026-07-24 FFT1571 PHX → SAN Jul 24, 21:29 UTCJul 24, 22:14 UTC45m
2026-07-24 FFT3871 SLC → PHX Jul 24, 18:55 UTCJul 24, 20:10 UTC1h 15m
2026-07-24 FFT3872 PHX → SLC Jul 24, 16:35 UTCJul 24, 17:45 UTC1h 10m
2026-07-24 FFT1747 PHL → MSY Jul 24, 12:58 UTCJul 24, 14:19 UTC1h 21m
2026-07-24 FFT1747 PHL → MSY Jul 24, 12:55 UTCJul 24, 14:20 UTC1h 25m
2026-07-24 FFT2016 LAS → DEN Jul 24, 08:45 UTCJul 24, 10:10 UTC1h 25m
2026-07-24 FFT1326 SAN → LAS Jul 24, 05:10 UTCJul 24, 06:00 UTC50m
2026-07-24 FFT1469 LAS → SAN Jul 24, 02:45 UTCJul 24, 03:30 UTC45m
2026-07-24 FFT1469 LAS → SAN Jul 24, 02:26 UTCJul 24, 03:29 UTC1h 3m
2026-07-23 FFT1850 SFO → LAS Jul 23, 23:55 UTCJul 24, 01:10 UTC1h 15m
2026-07-23 FFT3581 SNA → SFO Jul 23, 21:40 UTCJul 23, 22:40 UTC1h 0m
2026-07-23 FFT1699 CVG → ATL Jul 23, 19:25 UTCJul 23, 20:05 UTC40m
2026-07-23 FFT4108 BUR → LAS Jul 23, 17:25 UTCJul 23, 18:10 UTC45m
2026-07-23 FFT4107 LAS → BUR Jul 23, 14:15 UTCJul 23, 15:05 UTC50m
2026-07-23 FFT4242 MIA → MDW Jul 23, 03:45 UTCJul 23, 04:40 UTC55m
2026-07-23 FFT4241 MDW → MIA Jul 23, 01:35 UTCJul 23, 02:25 UTC50m
2026-07-22 FFT1696 LAS → CLE Jul 22, 23:20 UTCJul 23, 00:05 UTC45m
2026-07-22 FFT1696 LAS → CLE Jul 22, 23:24 UTCJul 23, 00:04 UTC40m
2026-07-22 FFT1699 CVG → ATL Jul 22, 21:30 UTCJul 22, 22:15 UTC45m
2026-07-22 FFT4158 SFO → LAS Jul 22, 19:00 UTCJul 22, 20:10 UTC1h 10m
2026-07-22 FFT1159 ONT → SFO Jul 22, 16:40 UTCJul 22, 17:35 UTC55m
2026-07-22 FFT1283 LAS → ONT Jul 22, 14:15 UTCJul 22, 14:50 UTC35m
2026-07-22 FFT3449 LAS → LAS Jul 22, 00:25 UTCJul 22, 04:20 UTC3h 55m
2026-07-21 FFT4158 SFO → LAS Jul 21, 21:15 UTCJul 21, 22:25 UTC1h 10m
2026-07-21 FFT1159 ONT → SFO Jul 21, 18:35 UTCJul 21, 19:30 UTC55m
2026-07-21 FFT1283 LAS → ONT Jul 21, 17:00 UTCJul 21, 17:35 UTC35m
2026-07-21 FFT1257 TPA → LAS Jul 21, 02:45 UTCJul 21, 06:50 UTC4h 5m
2026-07-20 FFT3054 ATL → TPA Jul 20, 23:45 UTCJul 21, 00:50 UTC1h 5m
2026-07-20 FFT3053 TPA → ATL Jul 20, 21:10 UTCJul 20, 22:20 UTC1h 10m
2026-07-20 FFT1537 BWI → TPA Jul 20, 16:45 UTCJul 20, 18:40 UTC1h 55m
2026-07-20 FFT4092 - Jul 20, 13:40 UTCJul 20, 15:35 UTC1h 55m
2026-07-20 FFT1258 LAS → TPA Jul 20, 08:10 UTCJul 20, 12:20 UTC4h 10m
2026-07-20 FFT1965 IAH → LAS Jul 20, 02:30 UTCJul 20, 05:00 UTC2h 30m
2026-07-19 FFT2395 BUF → RSW Jul 19, 22:40 UTCJul 20, 00:45 UTC2h 5m
2026-07-19 FFT2395 BUF → RSW Jul 19, 22:28 UTCJul 20, 00:41 UTC2h 13m
2026-07-19 FFT3037 - Jul 19, 19:10 UTCJul 19, 20:50 UTC1h 40m
2026-07-19 FFT4406 ATL → MIA Jul 19, 16:00 UTCJul 19, 17:30 UTC1h 30m
2026-07-19 FFT2483 MDW → SFO Jul 19, 12:40 UTCJul 19, 14:00 UTC1h 20m
2026-07-19 FFT4552 LAS → MIA Jul 19, 05:45 UTCJul 19, 10:10 UTC4h 25m
2026-07-19 FFT1196 BUR → LAS Jul 19, 01:00 UTCJul 19, 01:40 UTC40m
2026-07-18 FFT1195 LAS → BUR Jul 18, 23:10 UTCJul 18, 23:55 UTC45m
2026-07-18 FFT1195 LAS → BUR Jul 18, 23:13 UTCJul 18, 23:51 UTC38m

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 N331FR page for operator, model, and routing details .

Mode-S A39A13 frequently asked

What is Mode-S code A39A13?
A39A13 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N331FR.
Where is Mode-S A39A13 registered?
Mode-S code A39A13 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 A39A13 broadcasting right now?
Mode-S A39A13 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 A39A13, octal 50715023, decimal 10,721,811.
What flights does A39A13 operate?
Mode-S A39A13 has broadcast 20 distinct callsigns, including FFT4406, FFT685, FFT1699, FFT4964, FFT4306.