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 2h ago
Flights observed
218
Distinct callsigns
20
Country
US
Last broadcast
2h ago

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
AAL929 - 13 2026-07-03
AAL930 - 12 2026-07-04
AAL953 American Airlines 11 2026-05-22
AAL731 American Airlines 11 2026-06-04
AAL39 - 10 2026-07-02
AAL38 - 10 2026-07-05
AAL81 - 9 2026-07-10
AAL730 American Airlines 9 2026-06-04
AAL72 American Airlines 9 2026-06-23
AAL954 American Airlines 8 2026-05-23
AAL78 - 8 2026-07-08
AAL51 American Airlines 8 2026-06-05
AAL176 - 8 2026-07-12
AAL141 American Airlines 8 2026-05-31
AAL735 - 7 2026-07-09
AAL175 - 7 2026-07-11
AAL142 American Airlines 7 2026-06-02
AAL137 - 7 2026-07-13
AAL734 - 6 2026-07-10
AAL73 - 6 2026-07-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL73 - Jul 14, 06:35 UTCJul 14, 07:00 UTC25m
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
2026-07-05 AAL735 AUA → LGA Jul 5, 14:30 UTCJul 5, 22:30 UTC8h 0m
2026-07-05 AAL38 - Jul 5, 00:00 UTCJul 5, 08:00 UTC8h 0m
2026-07-04 AAL930 - Jul 4, 00:45 UTCJul 4, 08:15 UTC7h 30m
2026-07-04 AAL930 GRU → MIA Jul 4, 00:40 UTCJul 4, 08:14 UTC7h 34m
2026-07-03 AAL929 - Jul 3, 01:30 UTCJul 3, 09:05 UTC7h 35m
2026-07-03 AAL929 MIA → GRU Jul 3, 01:26 UTCJul 3, 09:05 UTC7h 39m
2026-07-02 AAL39 - Jul 2, 12:25 UTCJul 2, 21:05 UTC8h 40m
2026-07-02 AAL39 LHR → MIA Jul 2, 12:23 UTCJul 2, 21:05 UTC8h 42m
2026-07-02 AAL38 - Jul 2, 01:45 UTCJul 2, 09:45 UTC8h 0m
2026-07-02 AAL38 MIA → LHR Jul 2, 01:40 UTCJul 2, 09:41 UTC8h 1m
2026-07-01 AAL39 - Jul 1, 13:30 UTCJul 1, 23:10 UTC9h 40m
2026-07-01 AAL38 - Jul 1, 03:15 UTCJul 1, 10:55 UTC7h 40m
2026-06-30 AAL930 - Jun 30, 00:45 UTCJun 30, 08:40 UTC7h 56m
2026-06-29 AAL929 - Jun 29, 00:49 UTCJun 29, 08:14 UTC7h 25m
2026-06-29 AAL929 MIA → GRU Jun 29, 00:47 UTCJun 29, 08:11 UTC7h 24m
2026-06-28 AAL930 - Jun 28, 00:39 UTCJun 28, 08:29 UTC7h 50m
2026-06-27 AAL929 - Jun 27, 00:44 UTCJun 27, 08:35 UTC7h 50m
2026-06-26 AAL39 - Jun 26, 11:40 UTCJun 26, 20:10 UTC8h 30m
2026-06-26 AAL39 LHR → MIA Jun 26, 11:38 UTCJun 26, 20:08 UTC8h 30m
2026-06-26 AAL732 - Jun 26, 02:20 UTCJun 26, 09:05 UTC6h 45m
2026-06-26 AAL732 CLT → LHR Jun 26, 02:15 UTCJun 26, 09:04 UTC6h 49m
2026-06-25 AAL735 AUA → LGA Jun 25, 20:34 UTCJun 25, 22:59 UTC2h 25m
2026-06-25 AAL735 AUA → LGA Jun 25, 14:39 UTCJun 25, 20:30 UTC5h 50m
2026-06-25 AAL735 AUA → LGA Jun 25, 14:36 UTCJun 25, 22:58 UTC8h 22m
2026-06-25 AAL136 - Jun 25, 01:19 UTCJun 25, 11:04 UTC9h 45m
2026-06-23 AAL72 HNL → ORD Jun 23, 23:44 UTCJun 24, 12:35 UTC12h 51m
2026-06-23 AAL72 HNL → ORD Jun 23, 23:44 UTCJun 24, 12:30 UTC12h 45m
2026-06-23 AAL72 HNL → ORD Jun 23, 23:44 UTCJun 24, 12:22 UTC12h 38m
2026-06-23 AAL73 - Jun 23, 06:34 UTCJun 23, 21:24 UTC14h 50m

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 2h ago.
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 AAL929, AAL930, AAL953, AAL731, AAL39.