Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AA55BD

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N765ST · operated by AMERICAN AIRLINES INC

Hex
AA55BD
Octal
52452675
Decimal
11,163,069
Country
US
Tail
N765ST
Type
E170
No current signal · last broadcast 1h ago
Flights observed
734
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AA55BD.

Country allocation

The ICAO 24-bit address AA55BD 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
ENY3391 - 12 2026-07-07
ENY3973 Envoy Air 11 2026-06-12
ENY3839 - 11 2026-07-09
ENY4330 - 10 2026-06-21
ENY3595 Envoy Air 10 2026-05-13
ENY3494 Envoy Air 10 2026-05-13
ENY4151 - 9 2026-06-14
ENY3972 Envoy Air 9 2026-06-08
ENY3750 Envoy Air 9 2026-05-27
ENY3741 - 9 2026-07-10
ENY3457 Envoy Air 8 2026-05-06
ENY3996 - 7 2026-07-11
ENY3769 Envoy Air 7 2026-05-13
ENY3748 - 7 2026-06-27
ENY3739 - 7 2026-06-19
ENY3674 - 7 2026-07-13
ENY3668 - 7 2026-06-22
ENY3601 Envoy Air 7 2026-05-18
ENY3489 - 7 2026-07-11
ENY4144 - 6 2026-07-09

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 ENY3706 - Jul 14, 03:50 UTCJul 14, 04:30 UTC40m
2026-07-14 ENY3383 - Jul 14, 00:45 UTCJul 14, 02:00 UTC1h 15m
2026-07-13 ENY3383 - Jul 13, 22:40 UTCJul 13, 23:50 UTC1h 10m
2026-07-13 ENY3848 - Jul 13, 19:20 UTCJul 13, 20:45 UTC1h 25m
2026-07-13 ENY3848 XNA → ORD Jul 13, 19:20 UTCJul 13, 20:42 UTC1h 22m
2026-07-13 ENY3848 - Jul 13, 16:55 UTCJul 13, 18:05 UTC1h 10m
2026-07-13 ENY4103 - Jul 13, 14:35 UTCJul 13, 15:20 UTC45m
2026-07-13 ENY4103 - Jul 13, 12:35 UTCJul 13, 13:20 UTC45m
2026-07-13 ENY4094 - Jul 13, 10:10 UTCJul 13, 10:55 UTC45m
2026-07-13 ENY3674 - Jul 13, 00:10 UTCJul 13, 00:55 UTC45m
2026-07-12 ENY4000 MSP → ORD Jul 12, 21:20 UTCJul 12, 22:15 UTC55m
2026-07-12 ENY4000 MSP → ORD Jul 12, 21:16 UTCJul 12, 22:10 UTC54m
2026-07-12 ENY4000 - Jul 12, 19:01 UTCJul 12, 19:55 UTC55m
2026-07-12 ENY4190 - Jul 12, 16:40 UTCJul 12, 17:25 UTC45m
2026-07-12 ENY4190 TVC → ORD Jul 12, 16:32 UTCJul 12, 17:15 UTC43m
2026-07-12 ENY4190 - Jul 12, 14:55 UTCJul 12, 15:25 UTC30m
2026-07-12 ENY3656 - Jul 12, 11:50 UTCJul 12, 13:05 UTC1h 15m
2026-07-12 ENY3561 - Jul 12, 01:05 UTCJul 12, 02:10 UTC1h 5m
2026-07-11 ENY3996 - Jul 11, 20:30 UTCJul 11, 23:25 UTC2h 55m
2026-07-11 ENY3996 - Jul 11, 16:45 UTCJul 11, 19:25 UTC2h 40m
2026-07-11 ENY3489 - Jul 11, 14:15 UTCJul 11, 15:10 UTC55m
2026-07-11 ENY3489 ORD → CVG Jul 11, 12:20 UTCJul 11, 13:00 UTC40m
2026-07-11 ENY3763 ATW → ORD Jul 11, 10:10 UTCJul 11, 10:55 UTC45m
2026-07-11 ENY3790 - Jul 11, 04:15 UTCJul 11, 04:45 UTC30m
2026-07-11 ENY3738 - Jul 11, 00:55 UTCJul 11, 02:00 UTC1h 5m
2026-07-10 ENY3738 - Jul 10, 23:10 UTCJul 11, 00:15 UTC1h 5m
2026-07-10 ENY3398 - Jul 10, 19:30 UTCJul 10, 20:55 UTC1h 25m
2026-07-10 ENY3398 - Jul 10, 17:10 UTCJul 10, 18:20 UTC1h 10m
2026-07-10 ENY3741 - Jul 10, 15:40 UTCJul 10, 16:10 UTC30m
2026-07-10 ENY3741 - Jul 10, 14:15 UTCJul 10, 14:50 UTC35m
2026-07-10 ENY3813 - Jul 10, 11:20 UTCJul 10, 12:50 UTC1h 30m
2026-07-10 ENY3493 - Jul 10, 03:50 UTCJul 10, 05:15 UTC1h 25m
2026-07-09 ENY3783 - Jul 9, 23:15 UTCJul 10, 00:55 UTC1h 40m
2026-07-09 ENY3783 TYS → ORD Jul 9, 23:11 UTCJul 10, 00:56 UTC1h 45m
2026-07-09 ENY3783 - Jul 9, 21:05 UTCJul 9, 22:10 UTC1h 5m
2026-07-09 ENY3437 - Jul 9, 18:10 UTCJul 9, 18:50 UTC40m
2026-07-09 ENY3437 MSN → ORD Jul 9, 18:10 UTCJul 9, 18:43 UTC33m
2026-07-09 ENY3437 - Jul 9, 17:05 UTCJul 9, 17:30 UTC25m
2026-07-09 ENY3839 - Jul 9, 14:25 UTCJul 9, 15:50 UTC1h 25m
2026-07-09 ENY3839 - Jul 9, 12:00 UTCJul 9, 13:20 UTC1h 20m
2026-07-09 ENY3702 - Jul 9, 10:20 UTCJul 9, 10:50 UTC30m
2026-07-09 ENY3728 - Jul 9, 04:40 UTCJul 9, 05:20 UTC40m
2026-07-09 ENY4144 - Jul 9, 01:55 UTCJul 9, 02:40 UTC45m
2026-07-09 ENY4144 STL → ORD Jul 9, 01:51 UTCJul 9, 02:39 UTC48m
2026-07-09 ENY4144 ORD → STL Jul 9, 00:25 UTCJul 9, 01:15 UTC50m
2026-07-08 ENY3971 - Jul 8, 20:45 UTCJul 8, 22:10 UTC1h 25m
2026-07-08 ENY3971 BHM → ORD Jul 8, 20:42 UTCJul 8, 22:09 UTC1h 27m
2026-07-08 ENY3971 - Jul 8, 18:20 UTCJul 8, 19:40 UTC1h 20m
2026-07-08 ENY3480 - Jul 8, 15:40 UTCJul 8, 16:35 UTC55m
2026-07-08 ENY3480 - Jul 8, 13:50 UTCJul 8, 14:35 UTC45m

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 N765ST page for operator, model, and routing details .

Mode-S AA55BD frequently asked

What is Mode-S code AA55BD?
AA55BD is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N765ST.
Where is Mode-S AA55BD registered?
Mode-S code AA55BD 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 AA55BD broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA55BD, octal 52452675, decimal 11,163,069.
What flights does AA55BD operate?
Mode-S AA55BD has broadcast 20 distinct callsigns, including ENY3391, ENY3973, ENY3839, ENY4330, ENY3595.