Apparatus

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sensors Mode-S transponder

AA9B42

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N7827A · BOEING 737-700 · operated by SOUTHWEST AIRLINES CO

Hex
AA9B42
Octal
52515502
Decimal
11,180,866
Country
US
Tail
N7827A
Type
B737
No current signal · last broadcast Jul 26, 21:20 UTC
Flights observed
667
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 21:20 UTC

Last known position

Most recent position reported by Mode-S AA9B42.

Country allocation

The ICAO 24-bit address AA9B42 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
SWA317 - 7 2026-07-18
SWA181 Southwest Airlines 7 2026-07-20
SWA121 - 7 2026-07-08
SWA1207 Southwest Airlines 7 2026-06-07
SWA982 Southwest Airlines 6 2026-07-21
SWA3721 - 6 2026-04-13
SWA866 Southwest Airlines 5 2026-05-18
SWA328 Southwest Airlines 5 2026-06-26
SWA267 Southwest Airlines 5 2026-05-05
SWA120 - 5 2026-07-15
SWA980 Southwest Airlines 4 2026-04-18
SWA971 - 4 2026-04-16
SWA757 - 4 2026-04-13
SWA550 - 4 2026-07-05
SWA50 Southwest Airlines 4 2026-04-28
SWA4524 - 4 2026-07-12
SWA4301 - 4 2026-06-25
SWA3498 Southwest Airlines 4 2026-05-21
SWA3243 Southwest Airlines 4 2026-04-29
SWA3223 Southwest Airlines 4 2026-05-26

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 SWA3115 DEN → OAK Jul 26, 20:15 UTCJul 26, 21:20 UTC1h 5m
2026-07-26 SWA3115 DEN → OAK Jul 26, 15:15 UTCJul 26, 19:10 UTC3h 55m
2026-07-25 SWA1615 MSY → MDW Jul 25, 03:05 UTCJul 25, 05:00 UTC1h 55m
2026-07-25 SWA1615 MSY → MDW Jul 25, 03:03 UTCJul 25, 04:54 UTC1h 52m
2026-07-24 SWA1764 OMA → MDW Jul 24, 23:45 UTCJul 25, 01:20 UTC1h 35m
2026-07-24 SWA714 RDU → MDW Jul 24, 21:05 UTCJul 24, 22:05 UTC1h 0m
2026-07-24 SWA714 RDU → MDW Jul 24, 18:35 UTCJul 24, 19:55 UTC1h 20m
2026-07-24 SWA4601 SNA → SMF Jul 24, 15:55 UTCJul 24, 17:30 UTC1h 35m
2026-07-24 SWA3651 BUR → OAK Jul 24, 02:00 UTCJul 24, 03:40 UTC1h 40m
2026-07-23 SWA833 DTW → BNA Jul 23, 23:55 UTCJul 24, 00:30 UTC35m
2026-07-23 SWA833 DTW → BNA Jul 23, 23:50 UTCJul 24, 00:37 UTC47m
2026-07-23 SWA4540 LAS → SAN Jul 23, 22:10 UTCJul 23, 22:55 UTC45m
2026-07-23 SWA3151 MHT → MCO Jul 23, 20:30 UTCJul 23, 21:10 UTC40m
2026-07-23 SWA3151 MHT → MCO Jul 23, 18:20 UTCJul 23, 19:15 UTC55m
2026-07-23 SWA2431 DEN → LAS Jul 23, 16:20 UTCJul 23, 17:05 UTC45m
2026-07-23 SWA4582 BOS → MCO Jul 23, 13:40 UTCJul 23, 14:55 UTC1h 15m
2026-07-23 SWA4582 BOS → MCO Jul 23, 13:20 UTCJul 23, 14:52 UTC1h 32m
2026-07-23 SWA4582 BOS → MCO Jul 23, 11:10 UTCJul 23, 12:05 UTC55m
2026-07-23 SWA4451 MCO → BNA Jul 23, 03:15 UTCJul 23, 03:50 UTC35m
2026-07-22 SWA1097 BUR → SFO Jul 22, 22:35 UTCJul 23, 02:10 UTC3h 35m
2026-07-22 SWA1097 BUR → SFO Jul 22, 20:10 UTCJul 22, 21:10 UTC1h 0m
2026-07-22 SWA1097 BUR → SFO Jul 22, 18:15 UTCJul 22, 19:05 UTC50m
2026-07-22 SWA3555 SAV → BNA Jul 22, 16:10 UTCJul 22, 17:05 UTC55m
2026-07-22 SWA1844 SNA → OAK Jul 22, 13:50 UTCJul 22, 14:40 UTC50m
2026-07-22 SWA4586 - Jul 22, 05:15 UTCJul 22, 05:25 UTC10m
2026-07-22 SWA4586 LAS → FAT Jul 22, 05:11 UTCJul 22, 05:53 UTC42m
2026-07-22 SWA2485 LAX → OAK Jul 22, 02:50 UTCJul 22, 03:30 UTC40m
2026-07-22 SWA2174 SAN → BWI Jul 22, 01:05 UTCJul 22, 01:50 UTC45m
2026-07-21 SWA2012 - Jul 21, 22:00 UTCJul 21, 23:45 UTC1h 45m
2026-07-21 SWA2012 - Jul 21, 20:05 UTCJul 21, 21:05 UTC1h 0m
2026-07-21 SWA1223 TPA → BWI Jul 21, 16:45 UTCJul 21, 18:40 UTC1h 55m
2026-07-21 SWA1356 BOS → BWI Jul 21, 14:15 UTCJul 21, 15:40 UTC1h 25m
2026-07-21 SWA1356 BOS → BWI Jul 21, 12:30 UTCJul 21, 13:15 UTC45m
2026-07-21 SWA3328 BOS → BWI Jul 21, 07:45 UTCJul 21, 09:35 UTC1h 50m
2026-07-21 SWA982 IND → BWI Jul 21, 05:25 UTCJul 21, 06:20 UTC55m
2026-07-21 SWA982 IND → BWI Jul 21, 01:10 UTCJul 21, 04:20 UTC3h 10m
2026-07-20 SWA1203 - Jul 20, 20:35 UTCJul 20, 23:40 UTC3h 5m
2026-07-20 SWA181 OAK → PSP Jul 20, 16:38 UTCJul 20, 19:18 UTC2h 40m
2026-07-20 SWA4183 OGG → PHX Jul 20, 12:50 UTCJul 20, 14:55 UTC2h 5m
2026-07-20 SWA1576 SJC → SNA Jul 20, 02:25 UTCJul 20, 02:55 UTC30m
2026-07-19 SWA1576 SJC → SNA Jul 19, 23:45 UTCJul 20, 01:25 UTC1h 40m
2026-07-19 SWA899 - Jul 19, 18:50 UTCJul 19, 21:55 UTC3h 5m
2026-07-19 SWA899 - Jul 19, 16:00 UTCJul 19, 17:10 UTC1h 10m
2026-07-19 SWA1487 FLL → PIT Jul 19, 11:45 UTCJul 19, 14:50 UTC3h 5m
2026-07-19 SWA1487 FLL → PIT Jul 19, 11:43 UTCJul 19, 14:46 UTC3h 3m
2026-07-19 SWA1975 MDW → MCO Jul 19, 03:50 UTCJul 19, 05:45 UTC1h 55m
2026-07-19 SWA1810 BNA → LGA Jul 19, 02:05 UTCJul 19, 02:55 UTC50m
2026-07-18 SWA1447 OGG → SJC Jul 18, 23:00 UTCJul 19, 00:25 UTC1h 25m
2026-07-18 SWA1447 OGG → SJC Jul 18, 22:56 UTCJul 19, 00:24 UTC1h 28m
2026-07-18 SWA317 - Jul 18, 20:00 UTCJul 18, 21:35 UTC1h 35m

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 N7827A page for operator, model, and routing details .

Mode-S AA9B42 frequently asked

What is Mode-S code AA9B42?
AA9B42 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N7827A.
Where is Mode-S AA9B42 registered?
Mode-S code AA9B42 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 AA9B42 broadcasting right now?
No active broadcast right now. Last signal was Jul 26, 21:20 UTC.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AA9B42, octal 52515502, decimal 11,180,866.
What flights does AA9B42 operate?
Mode-S AA9B42 has broadcast 20 distinct callsigns, including SWA317, SWA181, SWA121, SWA1207, SWA982.