Apparatus

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sensors Mode-S transponder

A9961B

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N717AN · BOEING 777-300ER · operated by AMERICAN AIRLINES INC

Hex
A9961B
Octal
52313033
Decimal
11,114,011
Country
US
Tail
N717AN
Type
B77W
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
247
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S A9961B.

Country allocation

The ICAO 24-bit address A9961B 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
AAL953 American Airlines 14 2026-07-24
AAL731 - 14 2026-07-20
AAL929 - 13 2026-07-03
AAL730 American Airlines 13 2026-07-20
AAL930 - 12 2026-07-04
AAL72 - 12 2026-07-15
AAL51 American Airlines 12 2026-07-26
AAL954 American Airlines 11 2026-07-25
AAL39 - 10 2026-07-02
AAL38 - 10 2026-07-05
AAL142 American Airlines 10 2026-07-25
AAL81 - 9 2026-07-10
AAL141 American Airlines 9 2026-07-22
AAL78 - 8 2026-07-08
AAL20 American Airlines 8 2026-07-21
AAL176 - 8 2026-07-12
AAL735 - 7 2026-07-09
AAL216 American Airlines 7 2026-07-26
AAL175 - 7 2026-07-11
AAL137 - 7 2026-07-13

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 AAL216 SFO → DFW Jul 26, 21:30 UTCJul 26, 22:45 UTC1h 15m
2026-07-26 AAL51 LHR → DFW Jul 26, 08:20 UTCJul 26, 17:35 UTC9h 15m
2026-07-26 AAL51 LHR → DFW Jul 26, 08:18 UTCJul 26, 17:35 UTC9h 17m
2026-07-25 AAL142 JFK → LHR Jul 25, 13:55 UTCJul 25, 15:30 UTC1h 35m
2026-07-25 AAL142 JFK → LHR Jul 25, 13:53 UTCJul 25, 19:47 UTC5h 54m
2026-07-25 AAL954 EZE → JFK Jul 25, 00:20 UTCJul 25, 10:05 UTC9h 45m
2026-07-24 AAL953 JFK → EZE Jul 24, 05:05 UTCJul 24, 15:25 UTC10h 20m
2026-07-22 AAL141 LHR → JFK Jul 22, 17:25 UTCJul 23, 00:20 UTC6h 55m
2026-07-21 AAL20 DFW → LHR Jul 21, 23:10 UTCJul 22, 01:25 UTC2h 15m
2026-07-21 AAL20 DFW → LHR Jul 21, 23:06 UTCJul 22, 07:57 UTC8h 51m
2026-07-21 AAL51 LHR → DFW Jul 21, 08:55 UTCJul 21, 10:10 UTC1h 15m
2026-07-21 AAL51 LHR → DFW Jul 21, 08:50 UTCJul 21, 18:01 UTC9h 11m
2026-07-20 AAL730 CLT → LHR Jul 20, 22:35 UTCJul 21, 04:45 UTC6h 9m
2026-07-20 AAL730 CLT → LHR Jul 20, 22:31 UTCJul 21, 05:50 UTC7h 19m
2026-07-20 AAL731 - Jul 20, 09:05 UTCJul 20, 17:00 UTC7h 55m
2026-07-19 AAL730 CLT → LHR Jul 19, 23:05 UTCJul 20, 00:45 UTC1h 40m
2026-07-19 AAL730 CLT → LHR Jul 19, 23:02 UTCJul 20, 06:06 UTC7h 4m
2026-07-19 AAL731 - Jul 19, 08:35 UTCJul 19, 16:35 UTC8h 0m
2026-07-19 AAL731 LHR → CLT Jul 19, 08:32 UTCJul 19, 16:36 UTC8h 4m
2026-07-18 AAL142 JFK → LHR Jul 18, 14:25 UTCJul 18, 21:00 UTC6h 35m
2026-07-18 AAL954 - Jul 18, 00:29 UTCJul 18, 10:35 UTC10h 6m
2026-07-18 AAL954 EZE → JFK Jul 18, 00:27 UTCJul 18, 10:31 UTC10h 4m
2026-07-17 AAL953 JFK → EZE Jul 17, 03:58 UTCJul 17, 13:49 UTC9h 51m
2026-07-17 AAL953 JFK → EZE Jul 17, 03:59 UTCJul 17, 13:50 UTC9h 50m
2026-07-16 AAL9785 - Jul 16, 19:05 UTCJul 17, 00:04 UTC5h 0m
2026-07-16 AAL9785 LAX → JFK Jul 16, 19:02 UTCJul 17, 00:00 UTC4h 58m
2026-07-15 AAL72 SYD → LAX Jul 15, 00:00 UTCJul 15, 13:14 UTC13h 14m
2026-07-15 AAL72 SYD → LAX Jul 15, 00:00 UTCJul 15, 13:19 UTC13h 19m
2026-07-15 AAL72 - Jul 15, 00:00 UTCJul 15, 00:35 UTC35m
2026-07-14 AAL73 - Jul 14, 06:35 UTCJul 14, 20:50 UTC14h 15m
2026-07-13 AAL137 - Jul 13, 16:40 UTCJul 14, 03:00 UTC10h 20m
2026-07-12 AAL20 DFW → LHR Jul 12, 23:15 UTCJul 13, 08:15 UTC9h 0m
2026-07-12 AAL176 HND → DFW Jul 12, 08:02 UTCJul 12, 19:28 UTC11h 26m
2026-07-12 AAL176 - Jul 12, 08:05 UTCJul 12, 18:45 UTC10h 40m
2026-07-11 AAL175 DFW → HND Jul 11, 16:23 UTCJul 12, 04:46 UTC12h 23m
2026-07-11 AAL175 - Jul 11, 16:25 UTCJul 11, 22:40 UTC6h 15m
2026-07-10 AAL81 LHR → DFW Jul 10, 15:55 UTCJul 11, 01:25 UTC9h 30m
2026-07-10 AAL734 - Jul 10, 03:35 UTCJul 10, 10:45 UTC7h 10m
2026-07-09 AAL735 - Jul 9, 14:25 UTCJul 9, 22:35 UTC8h 10m
2026-07-09 AAL735 LHR → CLT Jul 9, 14:22 UTCJul 9, 22:34 UTC8h 12m
2026-07-09 AAL78P ORD → LHR Jul 9, 04:40 UTCJul 9, 11:55 UTC7h 15m
2026-07-08 AAL78 DFW → ORD Jul 8, 06:10 UTCJul 8, 10:15 UTC4h 5m
2026-07-07 AAL81 - Jul 7, 16:00 UTCJul 8, 00:55 UTC8h 55m
2026-07-07 AAL81 LHR → DFW Jul 7, 15:58 UTCJul 8, 00:49 UTC8h 51m
2026-07-07 AAL78 DFW → LHR Jul 7, 04:41 UTCJul 7, 13:25 UTC8h 44m
2026-07-07 AAL78 DFW → LHR Jul 7, 04:45 UTCJul 7, 13:35 UTC8h 50m
2026-07-06 AAL79 LHR → DFW Jul 6, 14:15 UTCJul 6, 23:20 UTC9h 5m
2026-07-06 AAL734 BQH → LHR Jul 6, 11:45 UTCJul 6, 12:00 UTC15m
2026-07-06 AAL734 - Jul 6, 04:40 UTCJul 6, 12:00 UTC7h 20m
2026-07-06 AAL734 CLT → LHR Jul 6, 04:38 UTCJul 6, 11:29 UTC6h 51m

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 N717AN page for operator, model, and routing details .

Mode-S A9961B frequently asked

What is Mode-S code A9961B?
A9961B is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N717AN.
Where is Mode-S A9961B registered?
Mode-S code A9961B 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 A9961B broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A9961B, octal 52313033, decimal 11,114,011.
What flights does A9961B operate?
Mode-S A9961B has broadcast 20 distinct callsigns, including AAL953, AAL731, AAL929, AAL730, AAL930.