Apparatus

Try JFK, AAL1290, BAW, or N225AN.

sensors Mode-S transponder

AC7A61

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N903AR · BOEING 747-400 · operated by UMB BANK NA TRUSTEE

Hex
AC7A61
Octal
53075141
Decimal
11,303,521
Country
US
Tail
N903AR
Type
B744
No current signal · last broadcast 2h ago
Flights observed
199
Distinct callsigns
20
Country
US
Last broadcast
2h ago

Last known position

Most recent position reported by Mode-S AC7A61.

Country allocation

The ICAO 24-bit address AC7A61 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
KYE9521 SkyLease Cargo 50 2026-07-18
KYE9520 - 39 2026-07-16
KYE7526 SkyLease Cargo 15 2026-05-30
KYE4525 SkyLease Cargo 14 2026-05-30
KYE7525 SkyLease Cargo 13 2026-05-29
KYE4524 SkyLease Cargo 13 2026-05-31
KYE4515 SkyLease Cargo 12 2026-05-05
KYE4514 SkyLease Cargo 10 2026-05-06
KYE4572 SkyLease Cargo 4 2026-05-26
KYE4521 SkyLease Cargo 4 2026-04-30
KYE4520 SkyLease Cargo 4 2026-04-30
KYE4526 SkyLease Cargo 3 2026-04-28
KYE4523 SkyLease Cargo 3 2026-04-27
KYE4522 SkyLease Cargo 3 2026-04-29
KYE4530 - 2 2026-05-16
KYE4517 SkyLease Cargo 2 2026-04-22
KYE9903 - 1 2026-06-19
KYE4570 SkyLease Cargo 1 2026-05-27
KYE4551 SkyLease Cargo 1 2026-05-13
KYE4550 SkyLease Cargo 1 2026-05-14

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-18 KYE9521 MIA → ANC Jul 18, 07:30 UTCJul 18, 07:40 UTC10m
2026-07-18 KYE9521 MIA → ANC Jul 18, 03:20 UTCJul 18, 04:55 UTC1h 35m
2026-07-17 KYE9521 MIA → ANC Jul 17, 13:29 UTCJul 18, 01:25 UTC11h 55m
2026-07-16 KYE9520 ANC → ORD Jul 16, 20:05 UTCJul 17, 01:39 UTC5h 35m
2026-07-16 KYE9520 - Jul 16, 10:45 UTCJul 16, 18:10 UTC7h 25m
2026-07-15 KYE9521 - Jul 15, 19:20 UTCJul 15, 20:00 UTC40m
2026-07-15 KYE9521 ORD → ICN Jul 15, 01:00 UTCJul 15, 14:25 UTC13h 25m
2026-07-14 KYE9520 - Jul 14, 05:50 UTCJul 14, 11:15 UTC5h 25m
2026-07-13 KYE9520 - Jul 13, 20:30 UTCJul 14, 03:55 UTC7h 25m
2026-07-13 KYE9521 - Jul 13, 13:55 UTCJul 13, 14:05 UTC10m
2026-07-13 KYE9521 - Jul 13, 07:01 UTCJul 13, 08:30 UTC1h 30m
2026-07-12 KYE9521 - Jul 12, 22:15 UTCJul 13, 04:55 UTC6h 40m
2026-07-12 KYE9521 - Jul 12, 13:01 UTCJul 12, 18:40 UTC5h 40m
2026-07-11 KYE9520 - Jul 11, 21:10 UTCJul 12, 02:35 UTC5h 25m
2026-07-11 KYE9520 - Jul 11, 11:50 UTCJul 11, 19:25 UTC7h 35m
2026-07-10 KYE9521 - Jul 10, 23:55 UTCJul 11, 00:30 UTC35m
2026-07-10 KYE9521 - Jul 10, 08:25 UTCJul 10, 21:50 UTC13h 25m
2026-07-09 KYE9520 ANC → ORD Jul 9, 17:25 UTCJul 9, 22:55 UTC5h 30m
2026-07-09 KYE9520 - Jul 9, 08:05 UTCJul 9, 15:35 UTC7h 30m
2026-07-08 KYE9521 - Jul 8, 19:40 UTCJul 8, 23:10 UTC3h 30m
2026-07-08 KYE9521 ORD → ICN Jul 8, 00:35 UTCJul 8, 13:45 UTC13h 10m
2026-07-07 KYE9520 ANC → ORD Jul 7, 03:15 UTCJul 7, 08:55 UTC5h 40m
2026-07-06 KYE9520 - Jul 6, 17:55 UTCJul 7, 01:20 UTC7h 25m
2026-07-06 KYE9521 - Jul 6, 11:45 UTCJul 6, 11:55 UTC10m
2026-07-06 KYE9521 - Jul 6, 03:50 UTCJul 6, 08:40 UTC4h 50m
2026-07-05 KYE9521 ORD → NRT Jul 5, 13:40 UTCJul 6, 01:40 UTC12h 0m
2026-07-04 KYE9520 ANC → ORD Jul 4, 22:35 UTCJul 5, 03:55 UTC5h 20m
2026-07-04 KYE9520 - Jul 4, 07:15 UTCJul 4, 20:40 UTC13h 25m
2026-07-04 KYE9521 - Jul 4, 00:35 UTCJul 4, 04:30 UTC3h 55m
2026-07-03 KYE9521 ORD → ICN Jul 3, 09:05 UTCJul 3, 22:25 UTC13h 20m
2026-07-02 KYE9520 ANC → ORD Jul 2, 17:50 UTCJul 2, 23:40 UTC5h 50m
2026-07-02 KYE9520 - Jul 2, 02:30 UTCJul 2, 16:20 UTC13h 49m
2026-07-01 KYE9521 - Jul 1, 19:35 UTCJul 1, 23:10 UTC3h 35m
2026-07-01 KYE9521 - Jul 1, 11:50 UTCJul 1, 14:00 UTC2h 10m
2026-07-01 KYE9521 - Jul 1, 01:15 UTCJul 1, 02:55 UTC1h 40m
2026-06-30 KYE9520 - Jun 30, 00:25 UTCJun 30, 04:40 UTC4h 16m
2026-06-29 KYE9520 - Jun 29, 09:05 UTCJun 29, 22:49 UTC13h 45m
2026-06-29 KYE9521 - Jun 29, 00:34 UTCJun 29, 05:30 UTC4h 55m
2026-06-28 KYE9521 ORD → NRT Jun 28, 10:39 UTCJun 28, 22:45 UTC12h 5m
2026-06-27 KYE9520 - Jun 27, 23:50 UTCJun 28, 05:34 UTC5h 45m
2026-06-27 KYE9520 - Jun 27, 08:49 UTCJun 27, 21:40 UTC12h 50m
2026-06-27 KYE9521 - Jun 27, 01:54 UTCJun 27, 06:05 UTC4h 10m
2026-06-26 KYE9521 - Jun 26, 09:35 UTCJun 26, 23:19 UTC13h 45m
2026-06-25 KYE9520 ANC → ORD Jun 25, 23:24 UTCJun 26, 04:55 UTC5h 30m
2026-06-25 KYE9520 - Jun 25, 13:59 UTCJun 25, 21:29 UTC7h 30m
2026-06-25 KYE9521 - Jun 25, 08:04 UTCJun 25, 08:24 UTC20m
2026-06-24 KYE9521 - Jun 24, 23:34 UTCJun 25, 04:25 UTC4h 50m
2026-06-24 KYE9521 - Jun 24, 09:15 UTCJun 24, 21:14 UTC12h 0m
2026-06-23 KYE9520 ANC → ORD Jun 23, 20:29 UTCJun 24, 01:49 UTC5h 20m
2026-06-23 KYE9520 - Jun 23, 05:20 UTCJun 23, 19:00 UTC13h 40m

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 N903AR page for operator, model, and routing details .

Mode-S AC7A61 frequently asked

What is Mode-S code AC7A61?
AC7A61 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N903AR.
Where is Mode-S AC7A61 registered?
Mode-S code AC7A61 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 AC7A61 broadcasting right now?
No active broadcast right now. Last signal was 2h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AC7A61, octal 53075141, decimal 11,303,521.
What flights does AC7A61 operate?
Mode-S AC7A61 has broadcast 20 distinct callsigns, including KYE9521, KYE9520, KYE7526, KYE4525, KYE7525.