Apparatus

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sensors Mode-S transponder

A203A9

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N229NN · EMBRAER ERJ-170-200 (long wing) · operated by AMERICAN AIRLINES INC

Hex
A203A9
Octal
50401651
Decimal
10,617,769
Country
US
Tail
N229NN
Type
E75L
No current signal · last broadcast 4d ago
Flights observed
779
Distinct callsigns
20
Country
US
Last broadcast
4d ago

Last known position

Most recent position reported by Mode-S A203A9.

Country allocation

The ICAO 24-bit address A203A9 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
ENY3621 - 10 2026-06-28
ENY3615 - 9 2026-06-27
ENY3495 - 9 2026-07-05
ENY4072 - 8 2026-07-01
ENY4064 - 8 2026-06-20
ENY3708 Envoy Air 8 2026-06-09
ENY3651 - 8 2026-07-06
ENY3401 - 8 2026-07-09
ENY3986 - 7 2026-06-24
ENY3617 - 7 2026-06-27
ENY3387 Envoy Air 7 2026-06-13
ENY4246 Envoy Air 6 2026-05-03
ENY4146 - 6 2026-07-22
ENY4066 - 6 2026-06-20
ENY3874 Envoy Air 6 2026-05-13
ENY3837 - 6 2026-06-18
ENY3730 - 6 2026-06-16
ENY3654 Envoy Air 6 2026-06-14
ENY3636 Envoy Air 6 2026-06-01
ENY3591 Envoy Air 6 2026-06-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ENY3464 ORD → ALB Jul 26, 19:40 UTCJul 26, 20:35 UTC55m
2026-07-26 ENY3464 ORD → ALB Jul 26, 17:50 UTCJul 26, 18:40 UTC50m
2026-07-26 ENY4038 TUL → PHX Jul 26, 13:55 UTCJul 26, 15:55 UTC2h 0m
2026-07-26 ENY3426 ORD → CVG Jul 26, 12:15 UTCJul 26, 13:05 UTC50m
2026-07-26 ENY3426 ORD → CVG Jul 26, 12:15 UTCJul 26, 12:58 UTC43m
2026-07-26 ENY3919 GRK → DFW Jul 26, 10:10 UTCJul 26, 10:40 UTC30m
2026-07-26 ENY3569 DFW → GRK Jul 26, 04:00 UTCJul 26, 04:25 UTC25m
2026-07-25 ENY3966 DFW → MSY Jul 25, 21:35 UTCJul 25, 23:30 UTC1h 55m
2026-07-25 ENY3966 DFW → MSY Jul 25, 20:54 UTCJul 25, 23:29 UTC2h 35m
2026-07-25 ENY3966 DFW → MSY Jul 25, 16:30 UTCJul 25, 18:15 UTC1h 45m
2026-07-25 ENY3966 DFW → MSY Jul 25, 16:25 UTCJul 25, 18:59 UTC2h 34m
2026-07-25 ENY4073 CMI → DFW Jul 25, 12:55 UTCJul 25, 14:25 UTC1h 30m
2026-07-25 ENY4073 CMI → DFW Jul 25, 12:51 UTCJul 25, 14:29 UTC1h 38m
2026-07-25 ENY3887 DFW → CMI Jul 25, 01:10 UTCJul 25, 02:45 UTC1h 35m
2026-07-24 ENY3535 MIA → AUS Jul 24, 23:10 UTCJul 24, 23:45 UTC35m
2026-07-24 ENY3535 MIA → AUS Jul 24, 23:09 UTCJul 24, 23:43 UTC34m
2026-07-24 ENY3533 ORD → CMH Jul 24, 21:35 UTCJul 24, 22:15 UTC40m
2026-07-24 ENY3516 ORD → DSM Jul 24, 18:50 UTCJul 24, 20:05 UTC1h 15m
2026-07-24 ENY3516 ORD → DSM Jul 24, 18:44 UTCJul 24, 19:58 UTC1h 14m
2026-07-24 ENY3516 ORD → DSM Jul 24, 16:40 UTCJul 24, 17:40 UTC1h 0m
2026-07-24 ENY3628 ATL → DCA Jul 24, 14:35 UTCJul 24, 15:20 UTC45m
2026-07-24 ENY3628 ATL → DCA Jul 24, 12:40 UTCJul 24, 13:20 UTC40m
2026-07-24 ENY3988 MSN → DCA Jul 24, 10:07 UTCJul 24, 10:48 UTC41m
2026-07-24 ENY4281 ORD → TUL Jul 24, 04:20 UTCJul 24, 05:40 UTC1h 20m
2026-07-24 ENY4281 ORD → TUL Jul 24, 04:15 UTCJul 24, 05:36 UTC1h 21m
2026-07-24 ENY3406 PIA → DFW Jul 24, 01:40 UTCJul 24, 03:00 UTC1h 20m
2026-07-24 ENY3406 PIA → DFW Jul 24, 00:25 UTCJul 24, 00:40 UTC15m
2026-07-23 ENY3406 PIA → DFW Jul 23, 20:50 UTCJul 23, 22:40 UTC1h 50m
2026-07-23 ENY3961 - Jul 23, 18:50 UTCJul 23, 19:40 UTC50m
2026-07-23 ENY4163 - Jul 23, 15:05 UTCJul 23, 17:25 UTC2h 20m
2026-07-23 ENY4163 MIA → CMH Jul 23, 15:04 UTCJul 23, 17:24 UTC2h 20m
2026-07-23 ENY4052 - Jul 23, 11:20 UTCJul 23, 13:35 UTC2h 15m
2026-07-22 ENY4087 CLT → XNA Jul 22, 22:45 UTCJul 23, 00:30 UTC1h 45m
2026-07-22 ENY4146 - Jul 22, 18:45 UTCJul 22, 20:05 UTC1h 20m
2026-07-22 ENY4146 - Jul 22, 16:10 UTCJul 22, 17:35 UTC1h 25m
2026-07-22 ENY4006 - Jul 22, 12:30 UTCJul 22, 14:00 UTC1h 30m
2026-07-22 ENY3990 ICT → ORD Jul 22, 01:05 UTCJul 22, 02:45 UTC1h 40m
2026-07-21 ENY4146 LIT → CLT Jul 21, 18:33 UTCJul 21, 19:59 UTC1h 26m
2026-07-21 ENY4146 - Jul 21, 15:50 UTCJul 21, 17:15 UTC1h 25m
2026-07-21 ENY4006 - Jul 21, 12:55 UTCJul 21, 14:15 UTC1h 20m
2026-07-21 ENY3990 ICT → ORD Jul 21, 01:40 UTCJul 21, 03:10 UTC1h 30m
2026-07-20 ENY3422 ORD → GSP Jul 20, 23:50 UTCJul 21, 00:15 UTC25m
2026-07-20 ENY3422 ORD → GSP Jul 20, 22:25 UTCJul 20, 22:35 UTC10m
2026-07-20 ENY4146 - Jul 20, 18:55 UTCJul 20, 20:25 UTC1h 30m
2026-07-20 ENY4146 - Jul 20, 16:15 UTCJul 20, 17:35 UTC1h 20m
2026-07-20 ENY4006 - Jul 20, 12:35 UTCJul 20, 13:55 UTC1h 20m
2026-07-20 ENY3990 ICT → ORD Jul 20, 01:20 UTCJul 20, 02:50 UTC1h 30m
2026-07-19 ENY3560 - Jul 19, 21:05 UTCJul 19, 21:50 UTC45m
2026-07-19 ENY3560 - Jul 19, 19:35 UTCJul 19, 20:05 UTC30m
2026-07-19 ENY3844 - Jul 19, 16:15 UTCJul 19, 17:45 UTC1h 30m

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 N229NN page for operator, model, and routing details .

Mode-S A203A9 frequently asked

What is Mode-S code A203A9?
A203A9 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N229NN.
Where is Mode-S A203A9 registered?
Mode-S code A203A9 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 A203A9 broadcasting right now?
No active broadcast right now. Last signal was 4d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A203A9, octal 50401651, decimal 10,617,769.
What flights does A203A9 operate?
Mode-S A203A9 has broadcast 20 distinct callsigns, including ENY3621, ENY3615, ENY3495, ENY4072, ENY4064.