Apparatus

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sensors Mode-S transponder

AB3639

ICAO 24-bit transponder address · allocated to United States

Currently assigned to N821SY · BOEING 737-800 · operated by UMB BANK NA TRUSTEE

Hex
AB3639
Octal
52633071
Decimal
11,220,537
Country
US
Tail
N821SY
Type
B738
No current signal · last broadcast 4h ago
Flights observed
124
Distinct callsigns
20
Country
US
Last broadcast
4h ago

Last known position

Most recent position reported by Mode-S AB3639.

Country allocation

The ICAO 24-bit address AB3639 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
SCX603 Sun Country Airlines 5 2026-05-25
SCX604 Sun Country Airlines 4 2026-05-25
SCX601 Sun Country Airlines 4 2026-05-14
SCX106 Sun Country Airlines 4 2026-04-22
SCX105 Sun Country Airlines 4 2026-04-21
SCX788 Sun Country Airlines 3 2026-04-13
SCX602 Sun Country Airlines 3 2026-05-14
SCX600 Sun Country Airlines 3 2026-04-18
SCX8993 Sun Country Airlines 2 2026-05-29
SCX8992 Sun Country Airlines 2 2026-05-28
SCX8991 Sun Country Airlines 2 2026-05-29
SCX8717 Sun Country Airlines 2 2026-05-10
SCX8674 Sun Country Airlines 2 2026-05-26
SCX8014 Sun Country Airlines 2 2026-04-20
SCX8013 Sun Country Airlines 2 2026-04-20
SCX762 Sun Country Airlines 2 2026-04-18
SCX761 Sun Country Airlines 2 2026-04-18
SCX636 Sun Country Airlines 2 2026-05-26
SCX635 Sun Country Airlines 2 2026-05-25
SCX608 Sun Country Airlines 2 2026-04-16

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-05-29 SCX8993 JAX → MSP May 29, 22:05 UTCMay 30, 00:50 UTC2h 45m
2026-05-29 SCX8991 MSP → BIF May 29, 20:00 UTCMay 29, 21:00 UTC1h 0m
2026-05-29 SCX8990 ADW → NBW May 29, 14:05 UTCMay 29, 15:00 UTC55m
2026-05-28 SCX8992 BIF → TCM May 28, 21:55 UTCMay 29, 00:25 UTC2h 30m
2026-05-28 SCX568 JFK → MSP May 28, 16:00 UTCMay 28, 18:30 UTC2h 30m
2026-05-28 SCX567 MSP → JFK May 28, 12:25 UTCMay 28, 14:30 UTC2h 5m
2026-05-27 SCX1954 TPA → MSP May 27, 13:40 UTCMay 27, 16:35 UTC2h 55m
2026-05-26 SCX8675 IND → PUJ May 26, 14:55 UTCMay 26, 23:45 UTC8h 50m
2026-05-26 SCX8674 SWO → MSP May 26, 12:05 UTCMay 26, 12:14 UTC10m
2026-05-26 SCX8674 SWO → MSP May 26, 11:05 UTCMay 26, 12:00 UTC55m
2026-05-26 SCX636 BNA → MSP May 26, 02:10 UTCMay 26, 03:50 UTC1h 40m
2026-05-25 SCX635 MSP → BNA May 25, 23:10 UTCMay 26, 00:49 UTC1h 40m
2026-05-25 SCX604 PHX → MSP May 25, 18:05 UTCMay 25, 20:40 UTC2h 34m
2026-05-25 SCX603 MSP → PHX May 25, 13:35 UTCMay 25, 16:30 UTC2h 55m
2026-05-25 SCX1746 TUL → MSP May 25, 01:55 UTCMay 25, 02:15 UTC20m
2026-05-24 SCX1748 CUN → TUL May 24, 20:10 UTCMay 24, 21:45 UTC1h 35m
2026-05-24 SCX1747 TUL → CUN May 24, 16:20 UTCMay 24, 18:55 UTC2h 35m
2026-05-24 SCX1745 MSP → TUL May 24, 13:40 UTCMay 24, 15:05 UTC1h 25m
2026-05-23 SCX572 CUN → MSP May 23, 18:40 UTCMay 23, 22:30 UTC3h 50m
2026-05-23 SCX571 MSP → CUN May 23, 12:15 UTCMay 23, 15:40 UTC3h 25m
2026-05-22 SCX1836 SAT → MSP May 22, 23:50 UTCMay 23, 02:05 UTC2h 15m
2026-05-22 SCX520 CUN → SAT May 22, 19:50 UTCMay 22, 22:10 UTC2h 20m
2026-05-22 SCX519 SAT → CUN May 22, 16:45 UTCMay 22, 18:40 UTC1h 55m
2026-05-22 SCX1835 MSP → SAT May 22, 12:25 UTCMay 22, 14:55 UTC2h 30m
2026-05-22 SCX1746 TUL → MSP May 22, 00:45 UTCMay 22, 02:05 UTC1h 20m
2026-05-21 SCX1748 CUN → TUL May 21, 20:40 UTCMay 21, 23:10 UTC2h 30m
2026-05-21 SCX1747 TUL → CUN May 21, 17:00 UTCMay 21, 19:30 UTC2h 30m
2026-05-21 SCX1745 MSP → TUL May 21, 13:35 UTCMay 21, 15:10 UTC1h 35m
2026-05-18 SCX326 JAX → MSP May 18, 18:55 UTCMay 18, 21:55 UTC3h 0m
2026-05-18 SCX325 MSP → JAX May 18, 15:10 UTCMay 18, 17:45 UTC2h 35m
2026-05-17 SCX500 IND → MSP May 17, 23:05 UTCMay 18, 00:20 UTC1h 15m
2026-05-17 SCX499 MSP → IND May 17, 20:30 UTCMay 17, 21:45 UTC1h 15m
2026-05-16 SCX8993 JAX → MSP May 16, 12:05 UTCMay 16, 14:41 UTC2h 35m
2026-05-15 SCX8991 MSP → BIF May 15, 14:45 UTCMay 15, 21:20 UTC6h 34m
2026-05-14 SCX8992 BIF → TCM May 14, 21:30 UTCMay 14, 23:55 UTC2h 25m
2026-05-14 SCX602 PHX → MSP May 14, 17:20 UTCMay 14, 19:55 UTC2h 35m
2026-05-14 SCX601 MSP → PHX May 14, 12:50 UTCMay 14, 15:45 UTC2h 55m
2026-05-11 SCX252 BOS → MSP May 11, 15:55 UTCMay 11, 18:40 UTC2h 46m
2026-05-11 SCX251 MSP → BOS May 11, 12:05 UTCMay 11, 14:15 UTC2h 10m
2026-05-11 SCX251 MSP → BOS May 11, 11:50 UTCMay 11, 11:55 UTC5m
2026-05-11 SCX396 SFO → MSP May 11, 01:20 UTCMay 11, 04:40 UTC3h 20m
2026-05-10 SCX395 MSP → SFO May 10, 20:05 UTCMay 10, 23:35 UTC3h 30m
2026-05-10 SCX1614 EWR → MSP May 10, 16:04 UTCMay 10, 18:35 UTC2h 30m
2026-05-10 SCX8717 MCO → EWR May 10, 00:39 UTCMay 10, 02:10 UTC1h 30m
2026-05-08 SCX8717 MCO → EWR May 8, 19:40 UTCMay 8, 21:55 UTC2h 15m
2026-05-08 SCX1613 MSP → EWR May 8, 12:20 UTCMay 8, 14:20 UTC2h 0m
2026-05-08 SCX636 BNA → MSP May 8, 01:04 UTCMay 8, 02:55 UTC1h 50m
2026-05-07 SCX635 MSP → BNA May 7, 21:55 UTCMay 7, 23:29 UTC1h 34m
2026-05-07 SCX208 SAV → MSP May 7, 17:45 UTCMay 7, 20:35 UTC2h 50m
2026-05-07 SCX207 MSP → SAV May 7, 14:10 UTCMay 7, 16:25 UTC2h 15m

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 N821SY page for operator, model, and routing details .

Mode-S AB3639 frequently asked

What is Mode-S code AB3639?
AB3639 is an ICAO 24-bit transponder address. Allocated to United States. Assigned to N821SY.
Where is Mode-S AB3639 registered?
Mode-S code AB3639 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 AB3639 broadcasting right now?
No active broadcast right now. Last signal was 4h ago.
Hex, octal, and decimal Mode-S codes: what's the difference?
The same 24-bit identifier expressed in different bases: hex AB3639, octal 52633071, decimal 11,220,537.
What flights does AB3639 operate?
Mode-S AB3639 has broadcast 20 distinct callsigns, including SCX603, SCX604, SCX601, SCX106, SCX105.