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
Broadcasting now · callsign ENY3387 · 24,700 ft
Flights observed
456
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Current position

A203A9 is currently broadcasting. Map zoomed to live position.

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
ENY3708 Envoy Air 8 2026-06-09
ENY3615 Envoy Air 8 2026-06-10
ENY4246 Envoy Air 6 2026-05-03
ENY3874 Envoy Air 6 2026-05-13
ENY3636 Envoy Air 6 2026-06-01
ENY4203 Envoy Air 5 2026-05-11
ENY4101 Envoy Air 5 2026-04-26
ENY3651 Envoy Air 5 2026-05-30
ENY3617 Envoy Air 5 2026-05-29
ENY3613 Envoy Air 5 2026-05-06
ENY3565 Envoy Air 5 2026-05-03
ENY3387 Envoy Air 5 2026-06-12
ENY4079 Envoy Air 4 2026-05-30
ENY3956 Envoy Air 4 2026-05-14
ENY3870 Envoy Air 4 2026-06-09
ENY3837 Envoy Air 4 2026-05-30
ENY3768 - 4 2026-06-12
ENY3697 Envoy Air 4 2026-04-24
ENY3654 Envoy Air 4 2026-06-09
ENY3567 Envoy Air 4 2026-05-20

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-06-12 ENY3387 MSY → MIA Jun 12, 23:45 UTCJun 13, 00:15 UTC30m
2026-06-12 ENY3768 - Jun 12, 21:55 UTCJun 12, 22:40 UTC45m
2026-06-12 ENY3768 - Jun 12, 13:40 UTCJun 12, 19:35 UTC5h 55m
2026-06-12 ENY3418 AUS → ORD Jun 12, 09:40 UTCJun 12, 12:10 UTC2h 30m
2026-06-11 ENY9870 ORD → DFW Jun 11, 20:45 UTCJun 11, 22:20 UTC1h 35m
2026-06-11 ENY3869 ABE → ORD Jun 11, 13:15 UTCJun 11, 15:00 UTC1h 45m
2026-06-11 ENY4107 FAR → ORD Jun 11, 10:10 UTCJun 11, 11:25 UTC1h 15m
2026-06-11 ENY4107 FAR → ORD Jun 11, 10:06 UTCJun 11, 11:25 UTC1h 19m
2026-06-11 ENY3450 SDF → BOS Jun 11, 02:50 UTCJun 11, 05:00 UTC2h 10m
2026-06-11 ENY3504 XNA → DFW Jun 11, 00:35 UTCJun 11, 01:50 UTC1h 15m
2026-06-10 ENY3504 XNA → DFW Jun 10, 22:20 UTCJun 10, 23:40 UTC1h 20m
2026-06-10 ENY3986 HRL → DFW Jun 10, 18:10 UTCJun 10, 20:15 UTC2h 5m
2026-06-10 ENY3986 HRL → DFW Jun 10, 18:04 UTCJun 10, 20:12 UTC2h 8m
2026-06-10 ENY3986 HRL → DFW Jun 10, 15:05 UTCJun 10, 17:05 UTC2h 0m
2026-06-10 ENY4119 GRR → DFW Jun 10, 12:35 UTCJun 10, 13:25 UTC50m
2026-06-10 ENY3615 ICT → ORD Jun 10, 04:00 UTCJun 10, 04:45 UTC45m
2026-06-10 ENY4276 LEX → ORD Jun 10, 01:15 UTCJun 10, 02:10 UTC55m
2026-06-09 ENY4276 LEX → ORD Jun 9, 23:20 UTCJun 10, 00:05 UTC45m
2026-06-09 ENY3870 GGG → DFW Jun 9, 21:10 UTCJun 9, 21:40 UTC30m
2026-06-09 ENY3870 GGG → DFW Jun 9, 20:35 UTCJun 9, 21:00 UTC25m
2026-06-09 ENY3708 BOS → STL Jun 9, 18:40 UTCJun 9, 19:45 UTC1h 5m
2026-06-09 ENY3708 BOS → STL Jun 9, 16:48 UTCJun 9, 17:40 UTC52m
2026-06-09 ENY3708 BOS → STL Jun 9, 15:15 UTCJun 9, 15:50 UTC35m
2026-06-09 ENY3654 FAR → ORD Jun 9, 10:40 UTCJun 9, 11:15 UTC35m
2026-06-09 ENY3654 FAR → ORD Jun 9, 10:36 UTCJun 9, 11:14 UTC38m
2026-06-09 ENY3431 DFW → BTR Jun 9, 06:00 UTCJun 9, 06:30 UTC30m
2026-06-08 ENY3507 DFW → STS Jun 8, 23:05 UTCJun 9, 00:40 UTC1h 35m
2026-06-08 ENY3507 DFW → STS Jun 8, 20:35 UTCJun 8, 22:00 UTC1h 25m
2026-06-08 ENY3577 DFW → LRD Jun 8, 17:20 UTCJun 8, 19:00 UTC1h 40m
2026-06-08 ENY3577 DFW → LRD Jun 8, 14:50 UTCJun 8, 16:15 UTC1h 25m
2026-06-08 ENY3521 ORD → SDF Jun 8, 11:20 UTCJun 8, 13:20 UTC2h 0m
2026-06-08 ENY4208 DFW → GJT Jun 8, 04:20 UTCJun 8, 06:10 UTC1h 50m
2026-06-08 ENY4208 DFW → GJT Jun 8, 04:18 UTCJun 8, 06:34 UTC2h 16m
2026-06-07 ENY3762 ORD → BWI Jun 7, 21:45 UTCJun 8, 02:10 UTC4h 25m
2026-06-07 ENY3924 CMI → DFW Jun 7, 18:55 UTCJun 7, 19:50 UTC55m
2026-06-07 ENY3924 CMI → DFW Jun 7, 14:35 UTCJun 7, 16:35 UTC2h 0m
2026-06-07 ENY4063 PHX → IAH Jun 7, 02:04 UTCJun 7, 04:05 UTC2h 0m
2026-06-07 ENY4063 PHX → IAH Jun 7, 02:02 UTCJun 7, 04:56 UTC2h 54m
2026-06-06 ENY3387 MSY → MIA Jun 6, 21:54 UTCJun 6, 22:15 UTC20m
2026-06-06 ENY3387 MSY → MIA Jun 6, 21:45 UTCJun 6, 22:57 UTC1h 12m
2026-06-06 ENY3387 MSY → MIA Jun 6, 20:05 UTCJun 6, 20:45 UTC40m
2026-06-06 ENY4010 BOS → ORD Jun 6, 17:24 UTCJun 6, 18:39 UTC1h 15m
2026-06-06 ENY4010 BOS → ORD Jun 6, 14:59 UTCJun 6, 15:54 UTC55m
2026-06-06 ENY3521 ORD → SDF Jun 6, 11:25 UTCJun 6, 13:20 UTC1h 55m
2026-06-06 ENY3521 ORD → SDF Jun 6, 11:02 UTCJun 6, 13:19 UTC2h 17m
2026-06-06 ENY4208 DFW → GJT Jun 6, 02:25 UTCJun 6, 04:20 UTC1h 55m
2026-06-05 ENY3461 AUS → TUL Jun 5, 23:20 UTCJun 6, 01:00 UTC1h 40m
2026-06-05 ENY3461 AUS → TUL Jun 5, 20:45 UTCJun 5, 22:20 UTC1h 35m
2026-06-05 ENY3384 CHS → DCA Jun 5, 18:35 UTCJun 5, 19:20 UTC45m
2026-06-05 ENY3384 CHS → DCA Jun 5, 16:35 UTCJun 5, 17:15 UTC40m

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?
Yes. Mode-S A203A9 is currently airborne.
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 ENY3708, ENY3615, ENY4246, ENY3874, ENY3636.