Apparatus

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sensors Mode-S transponder

AA91B5

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N780NC · operated by COMMUTEAIR LLC

Hex
AA91B5
Octal
52510665
Decimal
11,178,421
Country
US
Tail
N780NC
Type
E170
No current signal · last broadcast Jul 26, 21:15 UTC
Flights observed
55
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:15 UTC

Last known position

Most recent position reported by Mode-S AA91B5.

Country allocation

The ICAO 24-bit address AA91B5 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
UCA1503 CommutAir 7 2026-07-26
UCA1448 CommutAir 6 2026-06-14
UCA1548 CommutAir 5 2026-06-14
UCA1403 CommutAir 5 2026-07-26
UCA1550 - 3 2026-06-18
UCA1449 - 3 2026-06-18
UCA1549 CommutAir 2 2026-04-20
UCA1547 CommutAir 2 2026-04-16
UCA1541 CommutAir 2 2026-06-02
UCA1536 - 2 2026-07-20
UCA1509 CommutAir 2 2026-05-13
UCA1451 CommutAir 2 2026-05-18
UCA1436 - 2 2026-07-20
UCA1410 CommutAir 2 2026-05-31
UCA1540 CommutAir 1 2026-06-02
UCA1511 CommutAir 1 2026-06-01
UCA1510 CommutAir 1 2026-05-26
UCA1502 CommutAir 1 2026-07-19
UCA1500 - 1 2026-07-15
UCA1440 CommutAir 1 2026-06-02

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UCA1503 FTW → IAH Jul 26, 20:10 UTCJul 26, 21:15 UTC1h 5m
2026-07-26 UCA1403 AUS → COU Jul 26, 18:25 UTCJul 26, 19:35 UTC1h 10m
2026-07-26 UCA1503 FTW → IAH Jul 26, 15:30 UTCJul 26, 15:50 UTC20m
2026-07-24 UCA1403 AUS → COU Jul 24, 19:10 UTCJul 24, 20:20 UTC1h 10m
2026-07-24 UCA1503 FTW → IAH Jul 24, 14:35 UTCJul 24, 17:05 UTC2h 30m
2026-07-20 UCA1536 - Jul 20, 04:25 UTCJul 20, 05:55 UTC1h 30m
2026-07-20 UCA1436 - Jul 20, 00:25 UTCJul 20, 03:20 UTC2h 55m
2026-07-19 UCA1502 BTR → IAH Jul 19, 20:20 UTCJul 19, 20:45 UTC25m
2026-07-18 UCA1401 ORD → AUS Jul 18, 07:15 UTCJul 18, 07:35 UTC20m
2026-07-16 UCA1400 - Jul 16, 19:50 UTCJul 16, 23:05 UTC3h 15m
2026-07-15 UCA1500 - Jul 15, 19:20 UTCJul 15, 23:35 UTC4h 15m
2026-07-15 UCA1436 - Jul 15, 15:15 UTCJul 15, 17:45 UTC2h 30m
2026-07-14 UCA1536 - Jul 14, 20:05 UTCJul 14, 21:50 UTC1h 45m
2026-06-18 UCA1550 - Jun 18, 21:15 UTCJun 18, 22:40 UTC1h 25m
2026-06-18 UCA1449 - Jun 18, 19:00 UTCJun 18, 20:25 UTC1h 25m
2026-06-16 UCA1449 - Jun 16, 00:50 UTCJun 16, 02:00 UTC1h 10m
2026-06-15 UCA1550 - Jun 15, 22:45 UTCJun 15, 23:50 UTC1h 5m
2026-06-14 UCA1548 ACT → CLL Jun 14, 22:30 UTCJun 14, 23:00 UTC30m
2026-06-14 UCA1448 CLL → TYS Jun 14, 18:10 UTCJun 14, 21:35 UTC3h 25m
2026-06-08 UCA1448 CLL → TYS Jun 8, 16:00 UTCJun 8, 19:55 UTC3h 55m
2026-06-08 UCA1548 ACT → CLL Jun 8, 13:05 UTCJun 8, 13:30 UTC25m
2026-06-02 UCA1541 TYS → IAH Jun 2, 23:20 UTCJun 3, 00:15 UTC55m
2026-06-02 UCA1541 TYS → IAH Jun 2, 19:45 UTCJun 2, 21:55 UTC2h 10m
2026-06-02 UCA1440 OKC → TYS Jun 2, 17:00 UTCJun 2, 18:40 UTC1h 40m
2026-06-02 UCA1540 IAH → OKC Jun 2, 13:50 UTCJun 2, 14:50 UTC1h 0m
2026-06-01 UCA1511 MIA → IAH Jun 1, 00:15 UTCJun 1, 02:50 UTC2h 35m
2026-05-31 UCA1410 CLT → BDL May 31, 20:45 UTCMay 31, 22:25 UTC1h 40m
2026-05-26 UCA1410 CLT → BDL May 26, 21:04 UTCMay 26, 22:20 UTC1h 15m
2026-05-26 UCA1510 IAH → PDX May 26, 16:35 UTCMay 26, 18:55 UTC2h 20m
2026-05-23 UCA1503 FTW → IAH May 23, 18:50 UTCMay 23, 19:25 UTC35m
2026-05-23 UCA1403 AUS → COU May 23, 16:05 UTCMay 23, 17:55 UTC1h 50m
2026-05-20 UCA1404 AUS → LAS May 20, 21:25 UTCMay 20, 22:55 UTC1h 30m
2026-05-20 UCA1503 FTW → IAH May 20, 18:10 UTCMay 20, 19:15 UTC1h 5m
2026-05-20 UCA1448 CLL → TYS May 20, 16:00 UTCMay 20, 17:35 UTC1h 35m
2026-05-20 UCA1548 ACT → CLL May 20, 12:50 UTCMay 20, 14:10 UTC1h 20m
2026-05-18 UCA1451 OKC → BHM May 18, 20:40 UTCMay 18, 22:15 UTC1h 35m
2026-05-18 UCA1451 OKC → BHM May 18, 18:05 UTCMay 18, 19:30 UTC1h 24m
2026-05-17 UCA1548 ACT → CLL May 17, 00:55 UTCMay 17, 01:35 UTC40m
2026-05-16 UCA1409 SWO → CKB May 16, 21:25 UTCMay 16, 23:45 UTC2h 20m
2026-05-13 UCA1509 OKC → TCL May 13, 16:05 UTCMay 13, 18:15 UTC2h 10m
2026-05-13 UCA1509 OKC → TCL May 13, 13:20 UTCMay 13, 14:05 UTC45m
2026-04-27 UCA1503 FTW → IAH Apr 27, 01:45 UTCApr 27, 02:15 UTC30m
2026-04-26 UCA1403 AUS → COU Apr 26, 23:00 UTCApr 27, 00:55 UTC1h 55m
2026-04-23 UCA1403 AUS → COU Apr 23, 18:15 UTCApr 23, 20:00 UTC1h 45m
2026-04-23 UCA1503 FTW → IAH Apr 23, 15:45 UTCApr 23, 16:20 UTC35m
2026-04-20 UCA1549 CLL → IAH Apr 20, 00:45 UTCApr 20, 01:05 UTC20m
2026-04-19 UCA1448 CLL → TYS Apr 19, 23:00 UTCApr 19, 23:55 UTC55m
2026-04-19 UCA1550 FTW → BTR Apr 19, 20:00 UTCApr 19, 20:55 UTC55m
2026-04-18 UCA1448 CLL → TYS Apr 18, 21:55 UTCApr 19, 00:30 UTC2h 35m
2026-04-16 UCA1547 BTR → OCF Apr 16, 21:14 UTCApr 16, 21:39 UTC25m

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 N780NC page for operator, model, and routing details .

Mode-S AA91B5 frequently asked

What is Mode-S code AA91B5?
AA91B5 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N780NC.
Where is Mode-S AA91B5 registered?
Mode-S code AA91B5 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 AA91B5 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA91B5, octal 52510665, decimal 11,178,421.
What flights does AA91B5 operate?
Mode-S AA91B5 has broadcast 20 distinct callsigns, including UCA1503, UCA1448, UCA1548, UCA1403, UCA1550.