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
Broadcasting now · callsign UAL2317 · 34,900 ft
Flights observed
369
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:10 UTC

Current position

AA8A09 is currently broadcasting. Map zoomed to live position.

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 United Airlines 21 2026-07-25
UAL1719 United Airlines 18 2026-07-26
UAL1718 United Airlines 18 2026-07-26
UAL373 United Airlines 16 2026-07-24
UAL2268 United Airlines 16 2026-07-26
UAL638 United Airlines 15 2026-07-21
UAL1509 United Airlines 15 2026-07-25
UAL2633 - 9 2026-07-09
UAL2008 United Airlines 9 2026-05-09
UAL1022 - 9 2026-07-15
UAL599 - 8 2026-07-12
UAL501 - 8 2026-07-14
UAL2391 - 7 2026-07-09
UAL1604 - 7 2026-07-09
UAL2487 United Airlines 6 2026-05-20
UAL2276 - 6 2026-07-13
UAL1954 - 6 2026-07-19
UAL2499 United Airlines 5 2026-05-16
UAL2292 United Airlines 5 2026-04-22
UAL1962 United Airlines 5 2026-05-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL2268 IAD → MCO Jul 26, 15:30 UTCJul 26, 20:00 UTC4h 30m
2026-07-26 UAL1719 ORD → SFO Jul 26, 12:20 UTCJul 26, 12:55 UTC35m
2026-07-26 UAL1719 ORD → SFO Jul 26, 08:15 UTCJul 26, 08:25 UTC10m
2026-07-26 UAL1718 LAS → LAX Jul 26, 05:25 UTCJul 26, 05:30 UTC5m
2026-07-26 UAL1718 LAS → LAX Jul 26, 00:15 UTCJul 26, 00:50 UTC35m
2026-07-25 UAL1221 PDX → EWR Jul 25, 17:18 UTCJul 25, 22:13 UTC4h 55m
2026-07-25 UAL1509 SFO → HNL Jul 25, 04:50 UTCJul 25, 05:15 UTC25m
2026-07-25 UAL1509 SFO → HNL Jul 25, 00:10 UTCJul 25, 00:40 UTC30m
2026-07-24 UAL373 BTV → ORD Jul 24, 21:10 UTCJul 24, 22:05 UTC55m
2026-07-24 UAL373 BTV → ORD Jul 24, 17:30 UTCJul 24, 17:45 UTC15m
2026-07-24 UAL1509 SFO → HNL Jul 24, 05:05 UTCJul 24, 05:25 UTC20m
2026-07-24 UAL1509 SFO → HNL Jul 24, 00:11 UTCJul 24, 05:24 UTC5h 13m
2026-07-24 UAL1509 SFO → HNL Jul 24, 00:15 UTCJul 24, 00:50 UTC35m
2026-07-23 UAL373 BTV → ORD Jul 23, 21:10 UTCJul 23, 21:55 UTC45m
2026-07-23 UAL373 BTV → ORD Jul 23, 17:35 UTCJul 23, 17:50 UTC15m
2026-07-22 UAL1431 IAH → SNA Jul 22, 20:55 UTCJul 23, 02:20 UTC5h 25m
2026-07-22 UAL1868 LAX → EWR Jul 22, 14:25 UTCJul 22, 19:25 UTC5h 0m
2026-07-21 UAL347 PHL → DEN Jul 21, 20:25 UTCJul 21, 23:50 UTC3h 25m
2026-07-21 UAL2348 IAH → LGA Jul 21, 16:10 UTCJul 21, 18:15 UTC2h 5m
2026-07-21 UAL1176 SJC → ORD Jul 21, 13:10 UTCJul 21, 14:00 UTC50m
2026-07-21 UAL1176 SJC → ORD Jul 21, 09:30 UTCJul 21, 09:50 UTC20m
2026-07-21 UAL638 MCO → ORD Jul 21, 07:10 UTCJul 21, 07:25 UTC15m
2026-07-21 UAL638 MCO → ORD Jul 21, 02:25 UTCJul 21, 03:15 UTC50m
2026-07-20 UAL1577 RNO → SFO Jul 20, 20:30 UTCJul 21, 00:15 UTC3h 44m
2026-07-20 UAL1941 IAD → EWR Jul 20, 14:15 UTCJul 20, 18:05 UTC3h 50m
2026-07-19 UAL1967 - Jul 19, 23:50 UTCJul 20, 03:20 UTC3h 30m
2026-07-19 UAL1954 SFO → ORD Jul 19, 17:25 UTCJul 19, 21:05 UTC3h 40m
2026-07-19 UAL246 - Jul 19, 11:40 UTCJul 19, 15:30 UTC3h 50m
2026-07-19 UAL246 ORD → SFO Jul 19, 11:49 UTCJul 19, 15:26 UTC3h 37m
2026-07-19 UAL2278 ORD → SEA Jul 19, 05:55 UTCJul 19, 09:40 UTC3h 45m
2026-07-18 UAL2075 IAD → BDL Jul 18, 01:10 UTCJul 18, 05:55 UTC4h 46m
2026-07-18 UAL2075 IAD → BDL Jul 18, 01:03 UTCJul 18, 05:55 UTC4h 52m
2026-07-15 UAL347 DEN → IAD Jul 15, 20:10 UTCJul 15, 23:05 UTC2h 55m
2026-07-15 UAL1022 MCO → DEN Jul 15, 14:25 UTCJul 15, 17:40 UTC3h 15m
2026-07-14 UAL501 DEN → MCO Jul 14, 20:50 UTCJul 15, 00:25 UTC3h 34m
2026-07-14 UAL1865 IAD → DEN Jul 14, 14:25 UTCJul 14, 17:15 UTC2h 50m
2026-07-14 UAL2282 LAX → IAD Jul 14, 06:45 UTCJul 14, 11:25 UTC4h 40m
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

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?
Yes. Mode-S AA8A09 is currently airborne.
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, UAL373, UAL2268.