Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A35B39

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N315UU · BOEING 737 MAX 8 · operated by AMERICAN AIRLINES INC

Hex
A35B39
Octal
50655471
Decimal
10,705,721
Country
US
Tail
N315UU
Type
B38M
No current signal · last broadcast 2h ago
Flights observed
466
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S A35B39.

Country allocation

The ICAO 24-bit address A35B39 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
AAL2688 - 9 2026-06-19
AAL2644 - 7 2026-06-25
AAL3166 American Airlines 6 2026-05-20
AAL2744 American Airlines 6 2026-06-12
AAL952 - 5 2026-07-10
AAL2916 American Airlines 5 2026-05-06
AAL2855 - 5 2026-07-07
AAL2684 - 5 2026-06-24
AAL2599 American Airlines 5 2026-06-15
AAL2597 - 5 2026-06-15
AAL2269 - 5 2026-07-12
AAL2140 American Airlines 5 2026-06-10
AAL1859 American Airlines 5 2026-05-03
AAL1772 American Airlines 5 2026-05-28
AAL1361 American Airlines 5 2026-06-24
AAL1019 American Airlines 5 2026-06-14
AAL3316 American Airlines 4 2026-05-16
AAL3143 American Airlines 4 2026-04-19
AAL3058 American Airlines 4 2026-04-17
AAL2640 - 4 2026-07-10

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 AAL1427 - Jul 14, 02:50 UTCJul 14, 05:25 UTC2h 35m
2026-07-13 AAL2638 - Jul 13, 18:35 UTCJul 14, 00:05 UTC5h 30m
2026-07-13 AAL1856 - Jul 13, 11:20 UTCJul 13, 16:30 UTC5h 10m
2026-07-13 AAL2026 - Jul 13, 01:45 UTCJul 13, 04:05 UTC2h 20m
2026-07-13 AAL2026 JFK → MIA Jul 13, 01:41 UTCJul 13, 04:05 UTC2h 24m
2026-07-12 AAL1421 ORD → JFK Jul 12, 22:12 UTCJul 13, 00:03 UTC1h 51m
2026-07-12 AAL2269 - Jul 12, 17:30 UTCJul 12, 20:25 UTC2h 55m
2026-07-12 AAL2269 ORD → PBI Jul 12, 13:20 UTCJul 12, 15:45 UTC2h 25m
2026-07-12 AAL1652 PHL → ORD Jul 12, 09:20 UTCJul 12, 11:10 UTC1h 50m
2026-07-11 AAL1751 DEN → PHL Jul 11, 18:58 UTCJul 11, 22:05 UTC3h 7m
2026-07-11 AAL1751 DEN → PHL Jul 11, 19:00 UTCJul 11, 22:10 UTC3h 10m
2026-07-11 AAL3312 PHL → DEN Jul 11, 13:55 UTCJul 11, 17:25 UTC3h 30m
2026-07-11 AAL2970 ORD → PHL Jul 11, 10:40 UTCJul 11, 12:05 UTC1h 25m
2026-07-11 AAL2970 ORD → PHL Jul 11, 10:37 UTCJul 11, 12:04 UTC1h 27m
2026-07-10 AAL2640 - Jul 10, 22:55 UTCJul 11, 02:35 UTC3h 40m
2026-07-10 AAL2640 - Jul 10, 17:35 UTCJul 10, 21:20 UTC3h 45m
2026-07-10 AAL3100 LGA → ORD Jul 10, 14:00 UTCJul 10, 16:10 UTC2h 10m
2026-07-10 AAL952 - Jul 10, 02:00 UTCJul 10, 03:20 UTC1h 20m
2026-07-09 AAL952 - Jul 9, 21:50 UTCJul 9, 23:30 UTC1h 40m
2026-07-09 AAL952 MIA → CLT Jul 9, 21:48 UTCJul 10, 00:19 UTC2h 31m
2026-07-09 AAL1918 - Jul 9, 16:35 UTCJul 9, 18:35 UTC2h 0m
2026-07-09 AAL1918 IAH → MIA Jul 9, 16:33 UTCJul 9, 18:32 UTC1h 59m
2026-07-09 AAL1918 - Jul 9, 12:50 UTCJul 9, 15:00 UTC2h 10m
2026-07-08 AAL654 - Jul 8, 20:20 UTCJul 9, 01:40 UTC5h 20m
2026-07-08 AAL654 - Jul 8, 12:45 UTCJul 8, 18:30 UTC5h 45m
2026-07-08 AAL1080 LAS → MIA Jul 8, 06:00 UTCJul 8, 10:20 UTC4h 20m
2026-07-07 AAL2855 JFK → LAS Jul 7, 23:15 UTCJul 8, 04:15 UTC5h 0m
2026-07-07 AAL1161 - Jul 7, 20:00 UTCJul 7, 20:45 UTC45m
2026-07-07 AAL1485 - Jul 7, 11:50 UTCJul 7, 12:50 UTC1h 0m
2026-07-07 AAL1485 JFK → PUJ Jul 7, 11:48 UTCJul 7, 15:30 UTC3h 42m
2026-07-06 AAL1421 BOS → PHL Jul 6, 21:55 UTCJul 6, 23:30 UTC1h 35m
2026-07-06 AAL1421 BOS → PHL Jul 6, 21:51 UTCJul 6, 23:30 UTC1h 39m
2026-07-06 AAL2269 - Jul 6, 17:25 UTCJul 6, 20:05 UTC2h 40m
2026-07-06 AAL2269 PBI → ORD Jul 6, 17:22 UTCJul 6, 20:02 UTC2h 40m
2026-07-06 AAL2269 - Jul 6, 13:25 UTCJul 6, 15:50 UTC2h 25m
2026-07-06 AAL1652 PHL → ORD Jul 6, 10:00 UTCJul 6, 11:50 UTC1h 50m
2026-07-05 AAL1751 DEN → PHL Jul 5, 19:45 UTCJul 5, 23:05 UTC3h 20m
2026-07-05 AAL3312 PHL → DEN Jul 5, 14:00 UTCJul 5, 17:20 UTC3h 20m
2026-07-05 AAL3312 PHL → DEN Jul 5, 13:56 UTCJul 5, 17:14 UTC3h 18m
2026-07-05 AAL2970 ORD → PHL Jul 5, 10:15 UTCJul 5, 11:45 UTC1h 30m
2026-07-05 AAL1893 DFW → ORD Jul 5, 02:15 UTCJul 5, 03:55 UTC1h 40m
2026-07-04 AAL1337 - Jul 4, 18:50 UTCJul 4, 21:25 UTC2h 35m
2026-07-04 AAL2618 - Jul 4, 15:15 UTCJul 4, 15:30 UTC15m
2026-07-04 AAL2618 MIA → MBJ Jul 4, 15:12 UTCJul 4, 16:25 UTC1h 13m
2026-07-04 AAL1716 - Jul 4, 10:25 UTCJul 4, 12:45 UTC2h 20m
2026-07-04 AAL890 PHX → STL Jul 4, 02:30 UTCJul 4, 05:00 UTC2h 30m
2026-07-04 AAL890 PHX → STL Jul 4, 02:29 UTCJul 4, 04:55 UTC2h 26m
2026-07-04 AAL3186 LAS → PHX Jul 4, 00:35 UTCJul 4, 01:20 UTC45m
2026-07-04 AAL3186 LAS → PHX Jul 4, 00:35 UTCJul 4, 01:19 UTC44m
2026-07-03 AAL2877 ORD → LAS Jul 3, 20:00 UTCJul 3, 23:25 UTC3h 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 N315UU page for operator, model, and routing details .

Mode-S A35B39 frequently asked

What is Mode-S code A35B39?
A35B39 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N315UU.
Where is Mode-S A35B39 registered?
Mode-S code A35B39 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 A35B39 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 A35B39, octal 50655471, decimal 10,705,721.
What flights does A35B39 operate?
Mode-S A35B39 has broadcast 20 distinct callsigns, including AAL2688, AAL2644, AAL3166, AAL2744, AAL952.