Apparatus

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sensors Mode-S transponder

A39781

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N330TJ · BOEING 737 MAX 8 · operated by AMERICAN AIRLINES INC

Hex
A39781
Octal
50713601
Decimal
10,721,153
Country
US
Tail
N330TJ
Type
B38M
No current signal · last broadcast Jul 26, 20:25 UTC
Flights observed
401
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:25 UTC

Last known position

Most recent position reported by Mode-S A39781.

Country allocation

The ICAO 24-bit address A39781 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
AAL3316 - 8 2026-07-01
AAL2959 - 7 2026-07-03
AAL2689 - 7 2026-07-10
AAL888 American Airlines 6 2026-04-28
AAL2968 American Airlines 6 2026-04-29
AAL2546 - 6 2026-07-17
AAL1686 - 6 2026-07-15
AAL1512 - 5 2026-07-02
AAL920 - 4 2026-07-07
AAL872 American Airlines 4 2026-04-28
AAL802 - 4 2026-06-16
AAL490 American Airlines 4 2026-06-13
AAL3100 - 4 2026-06-28
AAL2718 - 4 2026-06-26
AAL264 American Airlines 4 2026-04-14
AAL2547 - 4 2026-07-17
AAL2510 American Airlines 4 2026-06-04
AAL2437 - 4 2026-06-28
AAL2316 American Airlines 4 2026-04-18
AAL2188 American Airlines 4 2026-04-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL1256 MIA → BDL Jul 26, 12:10 UTCJul 26, 20:25 UTC8h 15m
2026-07-25 AAL1421 BOS → PHL Jul 25, 22:20 UTCJul 26, 00:05 UTC1h 45m
2026-07-25 AAL3321 MIA → LAS Jul 25, 18:10 UTCJul 25, 20:05 UTC1h 55m
2026-07-25 AAL1289 BDA → JFK Jul 25, 15:25 UTCJul 25, 16:10 UTC45m
2026-07-25 AAL3210 PHX → ELP Jul 25, 11:15 UTCJul 25, 11:55 UTC40m
2026-07-25 AAL3210 PHX → ELP Jul 25, 11:14 UTCJul 25, 12:51 UTC1h 37m
2026-07-24 AAL832 DCA → BOS Jul 24, 23:15 UTCJul 25, 03:40 UTC4h 25m
2026-07-24 AAL832 DCA → BOS Jul 24, 23:12 UTCJul 25, 03:35 UTC4h 23m
2026-07-24 AAL2829 JFK → PHX Jul 24, 16:45 UTCJul 24, 21:30 UTC4h 45m
2026-07-24 AAL1051 CMH → CLT Jul 24, 12:40 UTCJul 24, 15:10 UTC2h 30m
2026-07-24 AAL1080 SJO → DFW Jul 24, 05:50 UTCJul 24, 10:15 UTC4h 25m
2026-07-24 AAL1080 SJO → DFW Jul 24, 05:46 UTCJul 24, 10:11 UTC4h 25m
2026-07-23 AAL2855 LGA → BNA Jul 23, 23:20 UTCJul 24, 04:15 UTC4h 55m
2026-07-23 AAL1161 SBP → DFW Jul 23, 17:40 UTCJul 23, 21:00 UTC3h 20m
2026-07-23 AAL1485 JFK → PUJ Jul 23, 12:15 UTCJul 23, 15:54 UTC3h 39m
2026-07-23 AAL1485 - Jul 23, 12:20 UTCJul 23, 13:30 UTC1h 10m
2026-07-22 AAL832 DCA → BOS Jul 22, 23:10 UTCJul 23, 03:55 UTC4h 45m
2026-07-22 AAL2829 JFK → PHX Jul 22, 16:57 UTCJul 22, 21:32 UTC4h 35m
2026-07-22 AAL2829 JFK → PHX Jul 22, 17:00 UTCJul 22, 21:30 UTC4h 30m
2026-07-22 AAL1051 CMH → CLT Jul 22, 12:40 UTCJul 22, 15:05 UTC2h 25m
2026-07-22 AAL2321 - Jul 22, 01:05 UTCJul 22, 02:35 UTC1h 30m
2026-07-21 AAL3153 IDA → DFW Jul 21, 19:47 UTCJul 21, 23:01 UTC3h 14m
2026-07-21 AAL3153 IDA → DFW Jul 21, 15:25 UTCJul 21, 23:10 UTC7h 45m
2026-07-21 AAL354 TPA → ORD Jul 21, 10:55 UTCJul 21, 13:25 UTC2h 30m
2026-07-21 AAL353 DFW → PVR Jul 21, 02:30 UTCJul 21, 04:35 UTC2h 5m
2026-07-21 AAL353 DFW → PVR Jul 21, 02:27 UTCJul 21, 04:30 UTC2h 3m
2026-07-20 AAL814 LAX → PHL Jul 20, 21:45 UTCJul 21, 00:55 UTC3h 9m
2026-07-20 AAL814 LAX → PHL Jul 20, 16:45 UTCJul 20, 20:25 UTC3h 40m
2026-07-20 AAL1327 JFK → CUN Jul 20, 12:25 UTCJul 20, 15:15 UTC2h 50m
2026-07-20 AAL1327 JFK → CUN Jul 20, 12:21 UTCJul 20, 15:13 UTC2h 52m
2026-07-20 AAL1134 - Jul 20, 01:45 UTCJul 20, 04:15 UTC2h 30m
2026-07-20 AAL1134 MIA → SLC Jul 20, 01:41 UTCJul 20, 05:50 UTC4h 9m
2026-07-19 AAL1126 - Jul 19, 20:30 UTCJul 19, 23:50 UTC3h 20m
2026-07-19 AAL1123 - Jul 19, 15:55 UTCJul 19, 19:15 UTC3h 20m
2026-07-19 AAL1123 MIA → BOG Jul 19, 15:54 UTCJul 19, 19:05 UTC3h 11m
2026-07-18 AAL448 SFO → CLT Jul 18, 14:30 UTCJul 18, 23:40 UTC9h 10m
2026-07-18 AAL2577 PDX → DFW Jul 18, 07:35 UTCJul 18, 12:50 UTC5h 15m
2026-07-18 AAL2577 PDX → DFW Jul 18, 07:31 UTCJul 18, 12:50 UTC5h 19m
2026-07-17 AAL2547 - Jul 17, 21:34 UTCJul 18, 00:55 UTC3h 20m
2026-07-17 AAL2546 - Jul 17, 19:30 UTCJul 17, 19:40 UTC10m
2026-07-17 AAL2546 - Jul 17, 16:29 UTCJul 17, 17:50 UTC1h 20m
2026-07-16 AAL2547 - Jul 16, 21:35 UTCJul 17, 01:00 UTC3h 25m
2026-07-16 AAL2547 MEX → LAX Jul 16, 21:32 UTCJul 17, 00:57 UTC3h 25m
2026-07-16 AAL2546 - Jul 16, 16:44 UTCJul 16, 18:05 UTC1h 20m
2026-07-16 AAL2546 LAX → MEX Jul 16, 16:43 UTCJul 16, 19:58 UTC3h 15m
2026-07-15 AAL1686 - Jul 15, 22:20 UTCJul 16, 02:15 UTC3h 55m
2026-07-15 AAL1686 - Jul 15, 16:45 UTCJul 15, 20:55 UTC4h 10m
2026-07-14 AAL2547 - Jul 14, 22:10 UTCJul 15, 01:25 UTC3h 14m
2026-07-14 AAL2546 - Jul 14, 19:45 UTCJul 14, 20:00 UTC15m
2026-07-14 AAL2546 - Jul 14, 16:40 UTCJul 14, 18:05 UTC1h 25m

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 N330TJ page for operator, model, and routing details .

Mode-S A39781 frequently asked

What is Mode-S code A39781?
A39781 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N330TJ.
Where is Mode-S A39781 registered?
Mode-S code A39781 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 A39781 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 20:25 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A39781, octal 50713601, decimal 10,721,153.
What flights does A39781 operate?
Mode-S A39781 has broadcast 20 distinct callsigns, including AAL3316, AAL2959, AAL2689, AAL888, AAL2968.