Apparatus

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sensors Mode-S transponder

A3CA1A

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N343SY · BOEING 737 MAX 8 · operated by AMERICAN AIRLINES INC

Hex
A3CA1A
Octal
50745032
Decimal
10,734,106
Country
US
Tail
N343SY
Type
B38M
Broadcasting now · callsign AAL825R · 34,000 ft
Flights observed
484
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 19:20 UTC

Current position

A3CA1A is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A3CA1A 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
AAL2744 - 6 2026-06-17
AAL1542 - 6 2026-06-25
AAL585 - 5 2026-07-15
AAL3165 American Airlines 5 2026-05-15
AAL2959 - 5 2026-07-13
AAL2343 American Airlines 5 2026-05-17
AAL2051 - 5 2026-06-25
AAL1788 American Airlines 5 2026-07-21
AAL1126 - 5 2026-07-05
AAL921 - 4 2026-07-07
AAL920 - 4 2026-07-11
AAL896 - 4 2026-06-28
AAL3300 - 4 2026-07-04
AAL3117 - 4 2026-04-13
AAL2984 American Airlines 4 2026-04-17
AAL2738 American Airlines 4 2026-06-04
AAL2685 American Airlines 4 2026-06-19
AAL2678 - 4 2026-07-07
AAL2470 - 4 2026-06-24
AAL2035 American Airlines 4 2026-04-25

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL1842 CLT → MSY Jul 26, 17:45 UTCJul 26, 19:20 UTC1h 35m
2026-07-26 AAL1693 PHX → SJC Jul 26, 13:20 UTCJul 26, 15:15 UTC1h 55m
2026-07-26 AAL1774 DFW → EUG Jul 26, 00:24 UTCJul 26, 02:59 UTC2h 35m
2026-07-26 AAL1774 DFW → EUG Jul 26, 00:25 UTCJul 26, 02:30 UTC2h 5m
2026-07-25 AAL2672 DEN → PHL Jul 25, 19:05 UTCJul 25, 21:45 UTC2h 40m
2026-07-25 AAL2672 DEN → PHL Jul 25, 19:03 UTCJul 25, 21:41 UTC2h 38m
2026-07-25 AAL2672 DEN → PHL Jul 25, 14:55 UTCJul 25, 17:20 UTC2h 25m
2026-07-25 AAL2668 JAC → DFW Jul 25, 02:05 UTCJul 25, 04:45 UTC2h 40m
2026-07-24 AAL2668 JAC → DFW Jul 24, 22:30 UTCJul 25, 00:55 UTC2h 25m
2026-07-24 AAL1911 CLT → PHX Jul 24, 18:20 UTCJul 24, 21:05 UTC2h 45m
2026-07-24 AAL1911 CLT → PHX Jul 24, 14:15 UTCJul 24, 16:55 UTC2h 40m
2026-07-24 AAL2782 IND → DFW Jul 24, 10:25 UTCJul 24, 10:30 UTC5m
2026-07-24 AAL2782 IND → DFW Jul 24, 10:22 UTCJul 24, 12:20 UTC1h 58m
2026-07-24 AAL766 PHL → BGR Jul 24, 02:10 UTCJul 24, 03:55 UTC1h 45m
2026-07-24 AAL766 PHL → BGR Jul 24, 01:55 UTCJul 24, 02:00 UTC5m
2026-07-24 AAL766 PHL → BGR Jul 24, 01:40 UTCJul 24, 01:45 UTC5m
2026-07-23 AAL684R STT → CLT Jul 23, 22:10 UTCJul 24, 00:50 UTC2h 40m
2026-07-23 AAL2684 PHL → PHX Jul 23, 17:50 UTCJul 23, 20:20 UTC2h 30m
2026-07-23 AAL701 PHL → DFW Jul 23, 12:45 UTCJul 23, 16:15 UTC3h 30m
2026-07-22 AAL567 PHX → BOS Jul 22, 22:55 UTCJul 23, 03:10 UTC4h 15m
2026-07-22 AAL3058 EWR → PHX Jul 22, 15:20 UTCJul 22, 19:55 UTC4h 35m
2026-07-22 AAL8R PSP → DFW Jul 22, 11:10 UTCJul 22, 13:10 UTC2h 0m
2026-07-21 AAL1788 MSY → PHL Jul 21, 21:53 UTCJul 22, 00:16 UTC2h 23m
2026-07-21 AAL1788 MSY → PHL Jul 21, 21:55 UTCJul 22, 00:20 UTC2h 25m
2026-07-21 AAL1053 DFW → SJO Jul 21, 17:00 UTCJul 21, 20:50 UTC3h 50m
2026-07-21 AAL1780 EGE → JFK Jul 21, 12:10 UTCJul 21, 14:35 UTC2h 25m
2026-07-21 AAL1780 EGE → JFK Jul 21, 12:09 UTCJul 21, 14:30 UTC2h 21m
2026-07-21 AAL3076 UVF → JFK Jul 21, 02:25 UTCJul 21, 06:50 UTC4h 25m
2026-07-20 AAL1812 COS → DFW Jul 20, 22:25 UTCJul 20, 23:55 UTC1h 30m
2026-07-20 AAL1812 COS → DFW Jul 20, 22:11 UTCJul 20, 23:54 UTC1h 43m
2026-07-20 AAL2451 PHL → MSY Jul 20, 18:30 UTCJul 20, 20:40 UTC2h 10m
2026-07-20 AAL1382 SNA → DFW Jul 20, 14:15 UTCJul 20, 16:55 UTC2h 40m
2026-07-20 AAL2637 PHX → SNA Jul 20, 04:25 UTCJul 20, 05:15 UTC50m
2026-07-19 AAL3191 DCA → PHX Jul 19, 22:24 UTCJul 20, 02:24 UTC4h 0m
2026-07-19 AAL3191 DCA → PHX Jul 19, 22:25 UTCJul 20, 02:25 UTC4h 0m
2026-07-19 AAL3191 PHX → DCA Jul 19, 15:50 UTCJul 19, 20:05 UTC4h 15m
2026-07-19 AAL2645 - Jul 19, 11:15 UTCJul 19, 13:20 UTC2h 5m
2026-07-19 AAL623 PHX → MCI Jul 19, 03:12 UTCJul 19, 05:30 UTC2h 18m
2026-07-19 AAL623 - Jul 19, 03:15 UTCJul 19, 05:30 UTC2h 15m
2026-07-18 AAL441 SRQ → ORD Jul 18, 21:40 UTCJul 19, 01:45 UTC4h 5m
2026-07-18 AAL550 JAX → PHL Jul 18, 15:45 UTCJul 18, 20:20 UTC4h 35m
2026-07-18 AAL1194 ORD → BOS Jul 18, 13:10 UTCJul 18, 14:05 UTC55m
2026-07-18 AAL1238 PHX → ONT Jul 18, 04:58 UTCJul 18, 05:46 UTC48m
2026-07-18 AAL1238 - Jul 18, 05:00 UTCJul 18, 05:50 UTC50m
2026-07-17 AAL502 - Jul 17, 21:55 UTCJul 18, 00:45 UTC2h 50m
2026-07-17 AAL502 MEX → PHX Jul 17, 21:54 UTCJul 18, 00:45 UTC2h 51m
2026-07-17 AAL501 PHX → MEX Jul 17, 20:10 UTCJul 17, 20:25 UTC15m
2026-07-17 AAL501 PHX → MEX Jul 17, 17:40 UTCJul 17, 18:29 UTC50m
2026-07-17 AAL501 PHX → MEX Jul 17, 17:39 UTCJul 17, 20:22 UTC2h 43m
2026-07-17 AAL653 BOS → CLT Jul 17, 12:00 UTCJul 17, 15:44 UTC3h 45m

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 N343SY page for operator, model, and routing details .

Mode-S A3CA1A frequently asked

What is Mode-S code A3CA1A?
A3CA1A is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N343SY.
Where is Mode-S A3CA1A registered?
Mode-S code A3CA1A 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 A3CA1A broadcasting right now?
Yes. Mode-S A3CA1A is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A3CA1A, octal 50745032, decimal 10,734,106.
What flights does A3CA1A operate?
Mode-S A3CA1A has broadcast 20 distinct callsigns, including AAL2744, AAL1542, AAL585, AAL3165, AAL2959.