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sensors Mode-S transponder

A54AAE

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N440AS · BOEING 737-900 · operated by ALASKA AIRLINES INC

Hex
A54AAE
Octal
51245256
Decimal
10,832,558
Country
US
Tail
N440AS
Type
B739
Broadcasting now · callsign ASA305 · 29,000 ft
Flights observed
428
Distinct callsigns
20
Country
US
Last broadcast
Jul 26, 20:55 UTC

Current position

A54AAE is currently broadcasting. Map zoomed to live position.

Country allocation

The ICAO 24-bit address A54AAE 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
ASA62 Alaska Airlines 6 2026-06-19
ASA707 Alaska Airlines 5 2026-05-29
ASA507 Alaska Airlines 5 2026-05-31
ASA714 Alaska Airlines 4 2026-05-12
ASA708 Alaska Airlines 4 2026-05-29
ASA693 - 4 2026-06-30
ASA540 Alaska Airlines 4 2026-05-16
ASA508 - 4 2026-07-20
ASA494 Alaska Airlines 4 2026-06-11
ASA419 Alaska Airlines 4 2026-04-18
ASA418 - 4 2026-07-09
ASA376 Alaska Airlines 4 2026-06-04
ASA333 - 4 2026-07-07
ASA31 Alaska Airlines 4 2026-06-09
ASA753 Alaska Airlines 3 2026-07-24
ASA742 Alaska Airlines 3 2026-05-25
ASA692 - 3 2026-07-10
ASA670 Alaska Airlines 3 2026-06-29
ASA605 Alaska Airlines 3 2026-04-18
ASA483 Alaska Airlines 3 2026-07-24

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-26 ASA775 PDX → ANC Jul 26, 17:45 UTCJul 26, 20:50 UTC3h 5m
2026-07-26 ASA1643 RNO → PDX Jul 26, 15:15 UTCJul 26, 16:20 UTC1h 5m
2026-07-26 ASA598 SFO → ORD Jul 26, 01:25 UTCJul 26, 02:35 UTC1h 10m
2026-07-25 ASA312 SEA → OMA Jul 25, 20:25 UTCJul 25, 23:35 UTC3h 10m
2026-07-25 ASA312 SEA → OMA Jul 25, 16:15 UTCJul 25, 18:50 UTC2h 35m
2026-07-25 ASA329 ORD → SEA Jul 25, 01:45 UTCJul 25, 05:45 UTC4h 0m
2026-07-24 ASA410 SEA → ORD Jul 24, 20:35 UTCJul 24, 23:55 UTC3h 20m
2026-07-24 ASA410 SEA → ORD Jul 24, 20:34 UTCJul 24, 23:50 UTC3h 16m
2026-07-24 ASA753 PSP → SEA Jul 24, 15:50 UTCJul 24, 18:10 UTC2h 20m
2026-07-24 ASA484 OGG → SAN Jul 24, 09:20 UTCJul 24, 14:13 UTC4h 53m
2026-07-24 ASA483 PDX → CUN Jul 24, 07:35 UTCJul 24, 07:50 UTC15m
2026-07-24 ASA483 PDX → CUN Jul 24, 02:40 UTCJul 24, 07:44 UTC5h 4m
2026-07-24 ASA483 PDX → CUN Jul 24, 02:25 UTCJul 24, 03:00 UTC35m
2026-07-23 ASA1432 LAX → PDX Jul 23, 22:35 UTCJul 24, 01:00 UTC2h 25m
2026-07-23 ASA785 LAS → SEA Jul 23, 18:45 UTCJul 23, 20:50 UTC2h 5m
2026-07-23 ASA612 SEA → LAS Jul 23, 15:05 UTCJul 23, 17:10 UTC2h 5m
2026-07-23 ASA550 EWR → SFO Jul 23, 02:25 UTCJul 23, 05:55 UTC3h 30m
2026-07-22 ASA380 SEA → MSP Jul 22, 22:00 UTCJul 23, 00:30 UTC2h 30m
2026-07-22 ASA1394 PDX → SAN Jul 22, 18:25 UTCJul 22, 20:40 UTC2h 15m
2026-07-22 ASA511 BNA → PDX Jul 22, 14:20 UTCJul 22, 16:45 UTC2h 25m
2026-07-22 ASA1550 ANC → SEA Jul 22, 10:20 UTCJul 22, 12:25 UTC2h 5m
2026-07-22 ASA767 PDX → SFO Jul 22, 02:05 UTCJul 22, 05:15 UTC3h 10m
2026-07-21 ASA456 SFO → ORD Jul 21, 22:20 UTCJul 22, 00:20 UTC2h 0m
2026-07-21 ASA456 SFO → ORD Jul 21, 22:29 UTCJul 22, 00:09 UTC1h 40m
2026-07-21 ASA209 LAX → SFO Jul 21, 19:15 UTCJul 21, 21:10 UTC1h 55m
2026-07-21 ASA645 PHX → SEA Jul 21, 14:35 UTCJul 21, 17:05 UTC2h 30m
2026-07-21 ASA632 SEA → PHX Jul 21, 03:20 UTCJul 21, 05:55 UTC2h 35m
2026-07-20 ASA508 - Jul 20, 21:20 UTCJul 21, 01:40 UTC4h 19m
2026-07-20 ASA508 SEA → CVG Jul 20, 16:00 UTCJul 20, 19:30 UTC3h 30m
2026-07-20 ASA279 SEA → BUR Jul 20, 13:25 UTCJul 20, 14:15 UTC50m
2026-07-20 ASA1614 LAX → GEG Jul 20, 03:15 UTCJul 20, 05:10 UTC1h 55m
2026-07-20 ASA534 - Jul 20, 00:10 UTCJul 20, 01:35 UTC1h 25m
2026-07-19 ASA437 - Jul 19, 18:40 UTCJul 19, 20:00 UTC1h 20m
2026-07-19 ASA437 LAX → PVR Jul 19, 18:42 UTCJul 19, 21:08 UTC2h 26m
2026-07-19 ASA581 PDX → LAX Jul 19, 14:20 UTCJul 19, 16:20 UTC2h 0m
2026-07-19 ASA1609 ANC → PDX Jul 19, 00:35 UTCJul 19, 03:45 UTC3h 10m
2026-07-18 ASA1825 PDX → ONT Jul 18, 16:10 UTCJul 18, 22:05 UTC5h 55m
2026-07-18 ASA1543 ANC → ORD Jul 18, 07:50 UTCJul 18, 13:30 UTC5h 40m
2026-07-18 ASA661 SEA → ANC Jul 18, 03:10 UTCJul 18, 06:10 UTC3h 0m
2026-07-17 ASA535 DEN → SEA Jul 17, 23:10 UTCJul 18, 01:25 UTC2h 15m
2026-07-17 ASA535 SEA → DEN Jul 17, 19:30 UTCJul 17, 21:39 UTC2h 10m
2026-07-17 ASA82 ANC → SEA Jul 17, 14:35 UTCJul 17, 17:50 UTC3h 15m
2026-07-17 ASA1363 - Jul 17, 08:49 UTCJul 17, 11:50 UTC3h 0m
2026-07-17 ASA493 - Jul 17, 04:49 UTCJul 17, 05:30 UTC40m
2026-07-17 ASA493 DEN → SEA Jul 17, 04:45 UTCJul 17, 06:49 UTC2h 4m
2026-07-17 ASA602 SEA → DEN Jul 17, 01:05 UTCJul 17, 03:20 UTC2h 15m
2026-07-16 ASA23 JFK → SEA Jul 16, 17:41 UTCJul 16, 22:32 UTC4h 51m
2026-07-16 ASA23 JFK → SEA Jul 16, 17:25 UTCJul 16, 22:49 UTC5h 25m
2026-07-15 ASA42 SFO → JFK Jul 15, 21:00 UTCJul 16, 02:15 UTC5h 15m
2026-07-15 ASA570 LAS → SFO Jul 15, 17:40 UTCJul 15, 18:50 UTC1h 10m

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 N440AS page for operator, model, and routing details .

Mode-S A54AAE frequently asked

What is Mode-S code A54AAE?
A54AAE is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N440AS.
Where is Mode-S A54AAE registered?
Mode-S code A54AAE 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 A54AAE broadcasting right now?
Yes. Mode-S A54AAE is currently airborne.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A54AAE, octal 51245256, decimal 10,832,558.
What flights does A54AAE operate?
Mode-S A54AAE has broadcast 20 distinct callsigns, including ASA62, ASA707, ASA507, ASA714, ASA708.