Apparatus

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sensors Mode-S transponder

AA8A09

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77867 · BOEING 757-300 · operated by UNITED AIRLINES INC

Hex
AA8A09
Octal
52505011
Decimal
11,176,457
Country
US
Tail
N77867
Type
B753
No current signal · last broadcast 1h ago
Flights observed
333
Distinct callsigns
20
Country
US
Last broadcast
1h ago

Last known position

Most recent position reported by Mode-S AA8A09.

Country allocation

The ICAO 24-bit address AA8A09 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
UAL1221 - 20 2026-07-11
UAL1719 - 16 2026-07-12
UAL1718 - 16 2026-07-12
UAL2268 - 15 2026-07-12
UAL638 - 13 2026-07-10
UAL373 - 12 2026-07-10
UAL1509 - 10 2026-07-11
UAL2633 - 9 2026-07-09
UAL2008 United Airlines 9 2026-05-09
UAL599 - 8 2026-07-12
UAL1022 - 8 2026-07-08
UAL501 - 7 2026-07-07
UAL2391 - 7 2026-07-09
UAL1604 - 7 2026-07-09
UAL2487 United Airlines 6 2026-05-20
UAL2276 - 6 2026-07-13
UAL2499 United Airlines 5 2026-05-16
UAL2292 United Airlines 5 2026-04-22
UAL1962 United Airlines 5 2026-05-16
UAL1954 - 5 2026-06-18

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-14 UAL2282 - Jul 14, 06:45 UTCJul 14, 10:15 UTC3h 30m
2026-07-13 UAL2276 - Jul 13, 22:15 UTCJul 14, 02:40 UTC4h 25m
2026-07-13 UAL2087 DEN → IAD Jul 13, 16:35 UTCJul 13, 19:40 UTC3h 5m
2026-07-12 UAL599 IAD → DEN Jul 12, 22:35 UTCJul 13, 01:35 UTC3h 0m
2026-07-12 UAL2268 - Jul 12, 15:35 UTCJul 12, 20:25 UTC4h 50m
2026-07-12 UAL2268 LAX → IAD Jul 12, 15:37 UTCJul 12, 20:22 UTC4h 45m
2026-07-12 UAL1719 - Jul 12, 12:35 UTCJul 12, 13:15 UTC40m
2026-07-12 UAL1719 - Jul 12, 08:20 UTCJul 12, 08:25 UTC5m
2026-07-12 UAL1718 - Jul 12, 00:30 UTCJul 12, 00:55 UTC25m
2026-07-12 UAL1718 LAX → KOA Jul 12, 00:26 UTCJul 12, 05:31 UTC5h 5m
2026-07-11 UAL1221 - Jul 11, 17:15 UTCJul 11, 17:35 UTC20m
2026-07-11 UAL1221 HNL → LAX Jul 11, 17:18 UTCJul 11, 22:19 UTC5h 1m
2026-07-11 UAL1509 SFO → HNL Jul 11, 00:11 UTCJul 11, 05:14 UTC5h 3m
2026-07-11 UAL1509 - Jul 11, 00:15 UTCJul 11, 05:15 UTC5h 0m
2026-07-10 UAL373 - Jul 10, 21:15 UTCJul 10, 21:55 UTC40m
2026-07-10 UAL373 - Jul 10, 17:10 UTCJul 10, 17:25 UTC15m
2026-07-10 UAL638 - Jul 10, 07:30 UTCJul 10, 07:45 UTC15m
2026-07-10 UAL638 SFO → HNL Jul 10, 02:42 UTCJul 10, 07:49 UTC5h 7m
2026-07-10 UAL638 - Jul 10, 02:35 UTCJul 10, 03:05 UTC30m
2026-07-09 UAL2633 DEN → SFO Jul 9, 22:25 UTCJul 10, 00:35 UTC2h 10m
2026-07-09 UAL1604 SFO → DEN Jul 9, 18:11 UTCJul 9, 20:19 UTC2h 8m
2026-07-09 UAL1604 - Jul 9, 18:10 UTCJul 9, 20:15 UTC2h 5m
2026-07-09 UAL2391 DEN → SFO Jul 9, 14:10 UTCJul 9, 16:30 UTC2h 20m
2026-07-09 UAL1654 - Jul 9, 00:45 UTCJul 9, 03:35 UTC2h 50m
2026-07-08 UAL1829 - Jul 8, 20:15 UTCJul 8, 22:50 UTC2h 35m
2026-07-08 UAL1022 MCO → DEN Jul 8, 14:15 UTCJul 8, 17:30 UTC3h 15m
2026-07-07 UAL501 DEN → MCO Jul 7, 20:55 UTCJul 8, 00:05 UTC3h 10m
2026-07-07 UAL1865 IAD → DEN Jul 7, 14:35 UTCJul 7, 17:40 UTC3h 5m
2026-07-07 UAL2282 - Jul 7, 06:50 UTCJul 7, 11:15 UTC4h 25m
2026-07-06 UAL2276 - Jul 6, 22:40 UTCJul 7, 03:20 UTC4h 40m
2026-07-06 UAL2268 - Jul 6, 15:30 UTCJul 6, 20:15 UTC4h 45m
2026-07-06 UAL2268 LAX → IAD Jul 6, 15:37 UTCJul 6, 20:10 UTC4h 33m
2026-07-06 UAL1719 - Jul 6, 12:25 UTCJul 6, 13:00 UTC35m
2026-07-06 UAL1719 - Jul 6, 08:20 UTCJul 6, 08:25 UTC5m
2026-07-06 UAL1718 - Jul 6, 00:30 UTCJul 6, 01:00 UTC30m
2026-07-06 UAL1718 LAX → KOA Jul 6, 00:26 UTCJul 6, 05:36 UTC5h 10m
2026-07-05 UAL1221 PDX → EWR Jul 5, 17:05 UTCJul 5, 22:00 UTC4h 55m
2026-07-04 UAL1509 - Jul 4, 23:55 UTCJul 5, 04:55 UTC5h 0m
2026-07-04 UAL373 BTV → ORD Jul 4, 21:05 UTCJul 4, 21:50 UTC45m
2026-07-04 UAL373 BTV → ORD Jul 4, 17:15 UTCJul 4, 17:30 UTC15m
2026-07-04 UAL1509 - Jul 4, 05:05 UTCJul 4, 05:20 UTC15m
2026-07-04 UAL1509 - Jul 4, 00:20 UTCJul 4, 00:50 UTC30m
2026-07-03 UAL373 BTV → ORD Jul 3, 21:20 UTCJul 3, 22:00 UTC40m
2026-07-03 UAL373 BTV → ORD Jul 3, 17:20 UTCJul 3, 17:40 UTC20m
2026-07-03 UAL1224 LAX → HNL Jul 3, 04:41 UTCJul 3, 10:25 UTC5h 44m
2026-07-03 UAL1224 - Jul 3, 04:40 UTCJul 3, 09:55 UTC5h 15m
2026-07-02 UAL2276 - Jul 2, 22:30 UTCJul 3, 03:15 UTC4h 45m
2026-07-02 UAL2268 - Jul 2, 15:50 UTCJul 2, 20:35 UTC4h 45m
2026-07-02 UAL2268 LAX → IAD Jul 2, 15:47 UTCJul 2, 20:35 UTC4h 48m
2026-07-02 UAL1719 KOA → LAX Jul 2, 08:28 UTCJul 2, 12:54 UTC4h 26m

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 N77867 page for operator, model, and routing details .

Mode-S AA8A09 frequently asked

What is Mode-S code AA8A09?
AA8A09 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77867.
Where is Mode-S AA8A09 registered?
Mode-S code AA8A09 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 AA8A09 broadcasting right now?
No active broadcast right now. Last signal was 1h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA8A09, octal 52505011, decimal 11,176,457.
What flights does AA8A09 operate?
Mode-S AA8A09 has broadcast 20 distinct callsigns, including UAL1221, UAL1719, UAL1718, UAL2268, UAL638.