Apparatus

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sensors Mode-S transponder

AA7F09

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N77579 · BOEING 737 MAX 9 · operated by UNITED AIRLINES INC

Hex
AA7F09
Octal
52477411
Decimal
11,173,641
Country
US
Tail
N77579
Type
B39M
No current signal · last broadcast Jul 26, 22:15 UTC
Flights observed
451
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:15 UTC

Last known position

Most recent position reported by Mode-S AA7F09.

Country allocation

The ICAO 24-bit address AA7F09 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
UAL2647 United Airlines 6 2026-04-25
UAL240 - 5 2026-07-17
UAL1760 United Airlines 5 2026-05-21
UAL1210 United Airlines 5 2026-07-22
UAL2673 United Airlines 4 2026-05-13
UAL2636 - 4 2026-07-16
UAL2002 - 4 2026-07-13
UAL1981 United Airlines 4 2026-06-22
UAL1693 - 4 2026-06-23
UAL1489 United Airlines 4 2026-07-16
UAL1462 - 4 2026-07-07
UAL1254 United Airlines 4 2026-07-21
UAL1147 - 4 2026-04-13
UAL1054 United Airlines 4 2026-06-08
UAL693 - 3 2026-06-17
UAL676 United Airlines 3 2026-05-20
UAL574 United Airlines 3 2026-06-11
UAL535 - 3 2026-06-21
UAL3752 - 3 2026-07-06
UAL2777 United Airlines 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL688 IAD → BOS Jul 26, 22:00 UTCJul 26, 22:15 UTC15m
2026-07-26 UAL1873 ORD → MSN Jul 26, 16:15 UTCJul 26, 20:10 UTC3h 55m
2026-07-25 UAL1938 RSW → EWR Jul 25, 22:25 UTCJul 26, 02:45 UTC4h 20m
2026-07-25 UAL1742 IAD → SFO Jul 25, 15:20 UTCJul 25, 19:50 UTC4h 30m
2026-07-24 UAL2435 IAD → SFO Jul 24, 22:30 UTCJul 25, 03:35 UTC5h 5m
2026-07-24 UAL2435 IAD → SFO Jul 24, 17:25 UTCJul 24, 19:40 UTC2h 15m
2026-07-24 UAL2435 IAD → SFO Jul 24, 17:28 UTCJul 24, 19:36 UTC2h 8m
2026-07-24 UAL1073 IAD → MIA Jul 24, 13:10 UTCJul 24, 15:15 UTC2h 5m
2026-07-24 UAL8183 LGA → YUL Jul 24, 06:40 UTCJul 24, 11:10 UTC4h 30m
2026-07-24 UAL2777 EWR → TPA Jul 24, 00:20 UTCJul 24, 05:05 UTC4h 45m
2026-07-23 UAL2777 EWR → TPA Jul 23, 23:54 UTCJul 24, 05:04 UTC5h 10m
2026-07-23 UAL2777 EWR → TPA Jul 23, 19:55 UTCJul 23, 22:10 UTC2h 15m
2026-07-23 UAL1197 PBI → EWR Jul 23, 15:20 UTCJul 23, 17:45 UTC2h 25m
2026-07-23 UAL1771 - Jul 23, 11:05 UTCJul 23, 13:55 UTC2h 50m
2026-07-22 UAL1053 CUN → EWR Jul 22, 21:10 UTCJul 23, 00:20 UTC3h 10m
2026-07-22 UAL1177 DEN → CUN Jul 22, 15:55 UTCJul 22, 19:35 UTC3h 40m
2026-07-22 UAL2666 ORD → DEN Jul 22, 11:10 UTCJul 22, 12:30 UTC1h 20m
2026-07-22 UAL1210 EWR → ATL Jul 22, 01:00 UTCJul 22, 04:05 UTC3h 5m
2026-07-21 UAL1254 PSP → SFO Jul 21, 22:00 UTCJul 21, 23:40 UTC1h 40m
2026-07-21 UAL730 COS → DEN Jul 21, 20:12 UTCJul 21, 20:27 UTC15m
2026-07-21 UAL730 COS → DEN Jul 21, 20:10 UTCJul 21, 20:30 UTC20m
2026-07-21 UAL1111 DEN → COS Jul 21, 18:25 UTCJul 21, 18:45 UTC20m
2026-07-21 UAL2412 DEN → MSP Jul 21, 12:50 UTCJul 21, 16:20 UTC3h 30m
2026-07-21 UAL1605 - Jul 21, 06:35 UTCJul 21, 11:25 UTC4h 50m
2026-07-21 UAL1605 LAX → BWI Jul 21, 06:23 UTCJul 21, 11:16 UTC4h 53m
2026-07-21 UAL298 AUS → EWR Jul 21, 03:05 UTCJul 21, 04:05 UTC1h 0m
2026-07-21 UAL233 DEN → SFO Jul 21, 00:40 UTCJul 21, 01:35 UTC55m
2026-07-21 UAL233 DEN → SFO Jul 21, 00:31 UTCJul 21, 01:30 UTC59m
2026-07-20 UAL2610 IAD → PDX Jul 20, 22:20 UTCJul 20, 23:15 UTC55m
2026-07-20 UAL1791 LAS → ORD Jul 20, 19:45 UTCJul 20, 20:35 UTC50m
2026-07-20 UAL360 DFW → EWR Jul 20, 10:50 UTCJul 20, 16:10 UTC5h 20m
2026-07-19 UAL1372 SFO → BOS Jul 19, 20:15 UTCJul 20, 01:20 UTC5h 5m
2026-07-19 UAL2192 PHL → ORD Jul 19, 13:05 UTCJul 19, 18:05 UTC5h 0m
2026-07-19 UAL2192 PHL → ORD Jul 19, 12:57 UTCJul 19, 18:00 UTC5h 3m
2026-07-19 UAL1646 SFO → AUS Jul 19, 00:19 UTCJul 19, 03:20 UTC3h 1m
2026-07-19 UAL1646 SFO → AUS Jul 19, 00:25 UTCJul 19, 03:25 UTC3h 0m
2026-07-18 UAL2338 PSP → SFO Jul 18, 20:25 UTCJul 18, 22:15 UTC1h 50m
2026-07-18 UAL8160 YYZ → DEL Jul 18, 17:20 UTCJul 18, 19:05 UTC1h 45m
2026-07-18 UAL8160 YYZ → DEL Jul 18, 17:18 UTCJul 18, 19:04 UTC1h 46m
2026-07-18 UAL595 AUS → DEN Jul 18, 13:55 UTCJul 18, 15:35 UTC1h 40m
2026-07-18 UAL1943 DEN → AUS Jul 18, 02:50 UTCJul 18, 04:35 UTC1h 45m
2026-07-18 UAL1943 DEN → AUS Jul 18, 02:47 UTCJul 18, 04:31 UTC1h 44m
2026-07-17 UAL2852 - Jul 17, 21:00 UTCJul 18, 01:00 UTC4h 0m
2026-07-17 UAL2295 EWR → MIA Jul 17, 16:29 UTCJul 17, 18:50 UTC2h 20m
2026-07-17 UAL240 - Jul 17, 12:15 UTCJul 17, 13:40 UTC1h 25m
2026-07-16 UAL1489 EWR → STI Jul 16, 23:38 UTCJul 17, 02:57 UTC3h 19m
2026-07-16 UAL1489 EWR → STI Jul 16, 23:40 UTCJul 17, 00:30 UTC50m
2026-07-16 UAL1892 - Jul 16, 19:30 UTCJul 16, 20:29 UTC1h 0m
2026-07-16 UAL1892 CLE → EWR Jul 16, 19:29 UTCJul 16, 20:30 UTC1h 1m
2026-07-16 UAL486 - Jul 16, 15:40 UTCJul 16, 17:35 UTC1h 55m

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 N77579 page for operator, model, and routing details .

Mode-S AA7F09 frequently asked

What is Mode-S code AA7F09?
AA7F09 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N77579.
Where is Mode-S AA7F09 registered?
Mode-S code AA7F09 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 AA7F09 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:15 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA7F09, octal 52477411, decimal 11,173,641.
What flights does AA7F09 operate?
Mode-S AA7F09 has broadcast 20 distinct callsigns, including UAL2647, UAL240, UAL1760, UAL1210, UAL2673.