Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

A37389

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N321RL · BOEING 737 MAX 8 · operated by WILMINGTON TRUST CO TRUSTEE

Hex
A37389
Octal
50671611
Decimal
10,711,945
Country
US
Tail
N321RL
Type
B38M
No current signal · last broadcast 2d ago
Flights observed
4
Distinct callsigns
2
Country
US
Last broadcast
2d ago

Last known position

Most recent position reported by Mode-S A37389.

Country allocation

The ICAO 24-bit address A37389 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 2 distinct

Callsign Airline Flights Last seen
AAL2507 - 3 2026-04-13
AAL2904 - 1 2026-04-12

Recent flights last 4

DateFlightRouteTakeoffLandingDuration
2026-04-13 AAL2507 - Apr 13, 00:20 UTCApr 13, 02:40 UTC2h 20m
2026-04-12 AAL2507 - Apr 12, 23:55 UTCApr 13, 02:40 UTC2h 45m
2026-04-12 AAL2507 - Apr 12, 20:00 UTCApr 12, 20:15 UTC15m
2026-04-12 AAL2904 - Apr 12, 17:15 UTCApr 12, 18:00 UTC45m

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 N321RL page for operator, model, and routing details .

Mode-S A37389 frequently asked

What is Mode-S code A37389?
A37389 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N321RL.
Where is Mode-S A37389 registered?
Mode-S code A37389 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 A37389 broadcasting right now?
No active broadcast right now. Last signal was 2d ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex A37389, octal 50671611, decimal 10,711,945.
What flights does A37389 operate?
Mode-S A37389 has broadcast 2 distinct callsigns, including AAL2507, AAL2904.