Apparatus

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sensors Mode-S transponder

AAA593

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N78509 · BOEING 737-800 · operated by UNITED AIRLINES INC

Hex
AAA593
Octal
52522623
Decimal
11,183,507
Country
US
Tail
N78509
Type
B738
No current signal · last broadcast Jul 26, 22:45 UTC
Flights observed
489
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 22:45 UTC

Last known position

Most recent position reported by Mode-S AAA593.

Country allocation

The ICAO 24-bit address AAA593 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
UAL1911 - 10 2026-07-20
UAL275 - 9 2026-07-19
UAL294 United Airlines 5 2026-06-05
UAL728 United Airlines 4 2026-05-06
UAL644 United Airlines 4 2026-06-10
UAL2605 United Airlines 4 2026-06-30
UAL2152 United Airlines 4 2026-06-05
UAL1867 United Airlines 4 2026-07-26
UAL1501 - 4 2026-06-21
UAL1098 - 4 2026-06-29
UAL8180 United Airlines 3 2026-06-04
UAL745 United Airlines 3 2026-05-27
UAL475 United Airlines 3 2026-06-08
UAL469 United Airlines 3 2026-07-25
UAL361 United Airlines 3 2026-06-06
UAL341 United Airlines 3 2026-04-13
UAL318 United Airlines 3 2026-07-18
UAL2639 United Airlines 3 2026-05-03
UAL2446 - 3 2026-07-08
UAL2442 United Airlines 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 UAL1867 CZM → IAH Jul 26, 21:00 UTCJul 26, 22:45 UTC1h 45m
2026-07-26 UAL1919 IAH → CZM Jul 26, 17:30 UTCJul 26, 19:20 UTC1h 50m
2026-07-26 UAL722 ORD → FLL Jul 26, 13:10 UTCJul 26, 15:10 UTC2h 0m
2026-07-25 UAL277 IAD → SFO Jul 25, 21:55 UTCJul 26, 00:05 UTC2h 10m
2026-07-25 UAL382 IAH → SAT Jul 25, 17:10 UTCJul 25, 19:40 UTC2h 30m
2026-07-25 UAL2047 LAS → SFO Jul 25, 12:55 UTCJul 25, 15:35 UTC2h 40m
2026-07-25 UAL469 IAH → ORD Jul 25, 10:40 UTCJul 25, 11:20 UTC40m
2026-07-25 UAL1542 SFO → YVR Jul 25, 01:15 UTCJul 25, 01:50 UTC35m
2026-07-25 UAL1542 SFO → YVR Jul 25, 01:25 UTCJul 25, 01:48 UTC23m
2026-07-24 UAL1794 OGG → SFO Jul 24, 20:15 UTCJul 24, 23:25 UTC3h 10m
2026-07-24 UAL678 LAS → SFO Jul 24, 15:10 UTCJul 24, 18:05 UTC2h 55m
2026-07-24 UAL2442 MSY → IAH Jul 24, 10:40 UTCJul 24, 12:40 UTC2h 0m
2026-07-24 UAL2069 IAH → CVG Jul 24, 02:00 UTCJul 24, 03:50 UTC1h 50m
2026-07-23 UAL1601 EWR → BOS Jul 23, 20:55 UTCJul 23, 22:55 UTC2h 0m
2026-07-23 UAL1600 - Jul 23, 17:35 UTCJul 23, 19:35 UTC2h 0m
2026-07-23 UAL1600 IAH → TQO Jul 23, 17:22 UTCJul 23, 19:37 UTC2h 15m
2026-07-23 UAL2228 - Jul 23, 13:45 UTCJul 23, 15:20 UTC1h 35m
2026-07-23 UAL1596 PDX → SFO Jul 23, 04:05 UTCJul 23, 05:15 UTC1h 10m
2026-07-22 UAL325 DEN → BOS Jul 22, 23:05 UTCJul 23, 01:20 UTC2h 15m
2026-07-22 UAL325 DEN → BOS Jul 22, 19:05 UTCJul 22, 21:05 UTC2h 0m
2026-07-22 UAL2318 DEN → LAX Jul 22, 11:15 UTCJul 22, 16:10 UTC4h 55m
2026-07-22 UAL1720 - Jul 22, 02:55 UTCJul 22, 05:25 UTC2h 30m
2026-07-21 UAL575 BOS → ORD Jul 21, 11:35 UTCJul 21, 13:30 UTC1h 55m
2026-07-20 UAL2864 - Jul 20, 23:35 UTCJul 21, 01:45 UTC2h 10m
2026-07-20 UAL1405 BZE → IAH Jul 20, 18:45 UTCJul 20, 20:35 UTC1h 50m
2026-07-20 UAL1405 BZE → IAH Jul 20, 18:31 UTCJul 20, 20:32 UTC2h 1m
2026-07-20 UAL1408 - Jul 20, 15:20 UTCJul 20, 17:05 UTC1h 45m
2026-07-20 UAL2442 MSY → IAH Jul 20, 11:00 UTCJul 20, 12:45 UTC1h 45m
2026-07-20 UAL2442 MSY → IAH Jul 20, 11:05 UTCJul 20, 12:48 UTC1h 43m
2026-07-20 UAL2069 IAH → CVG Jul 20, 03:55 UTCJul 20, 05:50 UTC1h 55m
2026-07-20 UAL2069 IAH → CVG Jul 20, 03:50 UTCJul 20, 05:45 UTC1h 55m
2026-07-20 UAL1911 - Jul 20, 01:30 UTCJul 20, 02:10 UTC40m
2026-07-19 UAL1911 - Jul 19, 23:50 UTCJul 20, 00:00 UTC10m
2026-07-19 UAL275 - Jul 19, 20:00 UTCJul 19, 20:10 UTC10m
2026-07-19 UAL275 - Jul 19, 17:50 UTCJul 19, 18:20 UTC30m
2026-07-19 UAL275 IAH → GUA Jul 19, 17:56 UTCJul 19, 20:08 UTC2h 12m
2026-07-19 UAL2760 - Jul 19, 13:40 UTCJul 19, 16:30 UTC2h 50m
2026-07-19 UAL1561 - Jul 19, 00:50 UTCJul 19, 01:55 UTC1h 5m
2026-07-18 UAL2077 EUG → SFO Jul 18, 21:30 UTCJul 18, 22:50 UTC1h 20m
2026-07-18 UAL318 EWR → DEN Jul 18, 17:35 UTCJul 18, 19:50 UTC2h 15m
2026-07-18 UAL1424 OKC → DEN Jul 18, 14:35 UTCJul 18, 15:45 UTC1h 10m
2026-07-17 UAL1184 DEN → OKC Jul 17, 23:50 UTCJul 18, 01:00 UTC1h 10m
2026-07-17 UAL1953 YYC → DEN Jul 17, 19:59 UTCJul 17, 22:10 UTC2h 11m
2026-07-17 UAL1953 YYC → DEN Jul 17, 20:15 UTCJul 17, 22:15 UTC2h 0m
2026-07-17 UAL1832 IAD → YYC Jul 17, 13:35 UTCJul 17, 18:05 UTC4h 30m
2026-07-15 UAL2131 - Jul 15, 20:05 UTCJul 16, 00:40 UTC4h 35m
2026-07-15 UAL2101 IAD → SEA Jul 15, 13:36 UTCJul 15, 18:08 UTC4h 32m
2026-07-15 UAL2101 IAD → SEA Jul 15, 13:25 UTCJul 15, 18:15 UTC4h 50m
2026-07-14 UAL2275 YYC → IAD Jul 14, 21:10 UTCJul 15, 01:05 UTC3h 54m
2026-07-14 UAL2459 DEN → YYC Jul 14, 17:50 UTCJul 14, 19:45 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 N78509 page for operator, model, and routing details .

Mode-S AAA593 frequently asked

What is Mode-S code AAA593?
AAA593 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N78509.
Where is Mode-S AAA593 registered?
Mode-S code AAA593 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 AAA593 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 22:45 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AAA593, octal 52522623, decimal 11,183,507.
What flights does AAA593 operate?
Mode-S AAA593 has broadcast 20 distinct callsigns, including UAL1911, UAL275, UAL294, UAL728, UAL644.