Apparatus

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sensors Mode-S transponder

A42A91

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N368FR · AIRBUS A-320neo · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A42A91
Octal
51025221
Decimal
10,758,801
Country
US
Tail
N368FR
Type
A20N
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
548
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S A42A91.

Country allocation

The ICAO 24-bit address A42A91 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
FFT4401 Frontier Airlines 6 2026-07-18
FFT4277 Frontier Airlines 6 2026-06-05
FFT2549 - 6 2026-07-04
FFT3738 Frontier Airlines 5 2026-07-19
FFT3291 - 5 2026-06-21
FFT2575 - 5 2026-06-21
FFT4602 Frontier Airlines 4 2026-07-25
FFT4404 Frontier Airlines 4 2026-04-20
FFT4278 Frontier Airlines 4 2026-06-05
FFT4169 Frontier Airlines 4 2026-04-21
FFT3664 Frontier Airlines 4 2026-04-14
FFT3417 Frontier Airlines 4 2026-06-13
FFT3322 Frontier Airlines 4 2026-07-21
FFT3232 Frontier Airlines 4 2026-06-01
FFT2550 - 4 2026-07-04
FFT2284 Frontier Airlines 4 2026-05-08
FFT2232 Frontier Airlines 4 2026-07-19
FFT2013 Frontier Airlines 4 2026-04-19
FFT1994 Frontier Airlines 4 2026-06-07
FFT1093 Frontier Airlines 4 2026-06-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 FFT2723 TPA → ATL Jul 26, 20:50 UTCJul 26, 22:00 UTC1h 10m
2026-07-26 FFT123 SDQ → TPA Jul 26, 17:30 UTCJul 26, 18:20 UTC50m
2026-07-26 FFT122 TPA → SDQ Jul 26, 12:15 UTCJul 26, 14:10 UTC1h 55m
2026-07-26 FFT122 TPA → SDQ Jul 26, 12:12 UTCJul 26, 14:35 UTC2h 23m
2026-07-26 FFT2746 DEN → TPA Jul 26, 06:05 UTCJul 26, 09:05 UTC3h 1m
2026-07-26 FFT2746 DEN → TPA Jul 26, 06:12 UTCJul 26, 09:00 UTC2h 48m
2026-07-26 FFT2745 TPA → DEN Jul 26, 01:10 UTCJul 26, 04:15 UTC3h 5m
2026-07-25 FFT1689 PWM → RDU Jul 25, 21:50 UTCJul 26, 00:00 UTC2h 10m
2026-07-25 FFT1690 RDU → PWM Jul 25, 17:15 UTCJul 25, 19:25 UTC2h 10m
2026-07-25 FFT3782 DTW → ATL Jul 25, 14:55 UTCJul 25, 16:00 UTC1h 5m
2026-07-25 FFT4601 EWR → ATL Jul 25, 10:15 UTCJul 25, 12:00 UTC1h 45m
2026-07-25 FFT4602 FLL → PHL Jul 25, 06:50 UTCJul 25, 08:35 UTC1h 45m
2026-07-25 FFT3453 PHL → MIA Jul 25, 03:55 UTCJul 25, 05:40 UTC1h 45m
2026-07-25 FFT3454 MIA → PHL Jul 25, 00:10 UTCJul 25, 02:05 UTC1h 55m
2026-07-24 FFT3454 MIA → PHL Jul 24, 23:47 UTCJul 25, 01:59 UTC2h 12m
2026-07-24 FFT4076 IAH → ATL Jul 24, 20:55 UTCJul 24, 22:35 UTC1h 40m
2026-07-24 FFT4076 IAH → ATL Jul 24, 20:45 UTCJul 24, 22:32 UTC1h 47m
2026-07-24 FFT2399 ATL → IAH Jul 24, 13:00 UTCJul 24, 14:35 UTC1h 35m
2026-07-24 FFT2717 FLL → ATL Jul 24, 01:35 UTCJul 24, 03:00 UTC1h 25m
2026-07-23 FFT2959 IAD → FLL Jul 23, 22:15 UTCJul 24, 00:30 UTC2h 15m
2026-07-23 FFT4410 ATL → IAD Jul 23, 19:10 UTCJul 23, 20:35 UTC1h 25m
2026-07-23 FFT1116 LAS → ATL Jul 23, 14:05 UTCJul 23, 17:45 UTC3h 40m
2026-07-21 FFT2335 PHL → PHX Jul 21, 22:15 UTCJul 21, 23:55 UTC1h 40m
2026-07-21 FFT3322 MIA → RDU Jul 21, 19:15 UTCJul 21, 20:55 UTC1h 40m
2026-07-21 FFT2676 DFW → MIA Jul 21, 15:25 UTCJul 21, 17:50 UTC2h 25m
2026-07-21 FFT2135 MIA → DFW Jul 21, 11:05 UTCJul 21, 13:40 UTC2h 35m
2026-07-21 FFT1068 IAH → MIA Jul 21, 01:50 UTCJul 21, 04:10 UTC2h 20m
2026-07-20 FFT2395 BUF → RSW Jul 20, 22:10 UTCJul 21, 00:00 UTC1h 49m
2026-07-20 FFT3037 MIA → CLT Jul 20, 19:05 UTCJul 20, 20:45 UTC1h 40m
2026-07-20 FFT3037 MIA → CLT Jul 20, 19:06 UTCJul 20, 20:45 UTC1h 39m
2026-07-20 FFT4406 ATL → MIA Jul 20, 16:00 UTCJul 20, 17:30 UTC1h 30m
2026-07-20 FFT2483 MDW → SFO Jul 20, 12:45 UTCJul 20, 14:10 UTC1h 25m
2026-07-20 FFT4552 LAS → MIA Jul 20, 05:45 UTCJul 20, 10:20 UTC4h 35m
2026-07-20 FFT3891 OKC → LAS Jul 20, 00:33 UTCJul 20, 02:35 UTC2h 2m
2026-07-20 FFT3891 OKC → LAS Jul 20, 00:25 UTCJul 20, 02:40 UTC2h 15m
2026-07-19 FFT1992 LAS → OKC Jul 19, 21:05 UTCJul 19, 23:20 UTC2h 15m
2026-07-19 FFT2232 ONT → LAS Jul 19, 19:00 UTCJul 19, 19:40 UTC40m
2026-07-19 FFT2232 ONT → LAS Jul 19, 19:05 UTCJul 19, 19:39 UTC34m
2026-07-19 FFT2678 HAF → ONT Jul 19, 16:55 UTCJul 19, 17:50 UTC55m
2026-07-19 FFT3019 LAS → SFO Jul 19, 14:15 UTCJul 19, 15:20 UTC1h 5m
2026-07-19 FFT3738 SNA → LAS Jul 19, 03:00 UTCJul 19, 03:45 UTC45m
2026-07-19 FFT3738 SNA → LAS Jul 19, 03:04 UTCJul 19, 03:45 UTC41m
2026-07-19 FFT3582 SFO → SNA Jul 19, 01:10 UTCJul 19, 02:15 UTC1h 5m
2026-07-18 FFT4401 LAS → SFO Jul 18, 22:05 UTCJul 18, 23:15 UTC1h 10m
2026-07-18 FFT3292 LAX → LAS Jul 18, 19:20 UTCJul 18, 20:05 UTC45m
2026-07-18 FFT4129 SLC → LAX Jul 18, 16:25 UTCJul 18, 17:50 UTC1h 25m
2026-07-18 FFT3016 LAS → SLC Jul 18, 14:13 UTCJul 18, 15:00 UTC47m
2026-07-18 FFT3016 LAS → SLC Jul 18, 14:05 UTCJul 18, 15:00 UTC55m
2026-07-18 FFT3738 - Jul 18, 03:45 UTCJul 18, 04:35 UTC50m
2026-07-18 FFT3738 SNA → LAS Jul 18, 03:50 UTCJul 18, 04:28 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 N368FR page for operator, model, and routing details .

Mode-S A42A91 frequently asked

What is Mode-S code A42A91?
A42A91 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N368FR.
Where is Mode-S A42A91 registered?
Mode-S code A42A91 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 A42A91 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A42A91, octal 51025221, decimal 10,758,801.
What flights does A42A91 operate?
Mode-S A42A91 has broadcast 20 distinct callsigns, including FFT4401, FFT4277, FFT2549, FFT3738, FFT3291.