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 10h ago
Flights observed
216
Distinct callsigns
20
Country
US
Last broadcast
10h 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 6 2026-06-18
SCX604 - 5 2026-06-18
SCX601 Sun Country Airlines 4 2026-05-14
SCX520 - 4 2026-07-02
SCX1836 - 4 2026-07-02
SCX1835 - 4 2026-07-02
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
SCX519 - 3 2026-07-02
SCX472 Sun Country Airlines 3 2026-06-11
SCX471 Sun Country Airlines 3 2026-06-10
SCX422 Sun Country Airlines 3 2026-06-04
SCX421 Sun Country Airlines 3 2026-06-04
SCX285 Sun Country Airlines 3 2026-06-07
SCX194 - 3 2026-07-13
SCX193 - 3 2026-07-13
SCX1747 - 3 2026-06-28

Recent flights last 50

DateFlightRouteTakeoffLandingDuration
2026-07-13 SCX656 DEN → MSP Jul 13, 23:45 UTCJul 14, 01:20 UTC1h 35m
2026-07-13 SCX655 MSP → DEN Jul 13, 20:20 UTCJul 13, 21:45 UTC1h 25m
2026-07-13 SCX194 - Jul 13, 16:40 UTCJul 13, 18:40 UTC2h 0m
2026-07-13 SCX193 MSP → BWI Jul 13, 13:20 UTCJul 13, 15:25 UTC2h 5m
2026-07-13 SCX659 DEN → MSP Jul 13, 01:10 UTCJul 13, 02:45 UTC1h 35m
2026-07-12 SCX657 MSP → DEN Jul 12, 21:40 UTCJul 12, 23:10 UTC1h 30m
2026-07-12 SCX668 IAD → MSP Jul 12, 18:15 UTCJul 12, 20:15 UTC2h 0m
2026-07-12 SCX667 MSP → IAD Jul 12, 14:55 UTCJul 12, 17:01 UTC2h 5m
2026-07-02 SCX1836 - Jul 2, 23:50 UTCJul 3, 02:05 UTC2h 15m
2026-07-02 SCX520 - Jul 2, 20:10 UTCJul 2, 22:25 UTC2h 15m
2026-07-02 SCX519 - Jul 2, 16:30 UTCJul 2, 18:40 UTC2h 10m
2026-07-02 SCX1835 - Jul 2, 12:20 UTCJul 2, 15:10 UTC2h 50m
2026-06-29 SCX1746 - Jun 29, 21:14 UTCJun 29, 22:39 UTC1h 25m
2026-06-29 SCX905 - Jun 29, 16:29 UTCJun 29, 19:29 UTC3h 0m
2026-06-28 SCX1747 - Jun 28, 16:25 UTCJun 28, 18:55 UTC2h 30m
2026-06-28 SCX1745 MSP → TUL Jun 28, 13:40 UTCJun 28, 15:14 UTC1h 35m
2026-06-25 SCX1836 - Jun 25, 23:39 UTCJun 26, 02:00 UTC2h 20m
2026-06-25 SCX520 - Jun 25, 19:39 UTCJun 25, 21:50 UTC2h 10m
2026-06-25 SCX519 - Jun 25, 16:14 UTCJun 25, 18:19 UTC2h 5m
2026-06-25 SCX1835 - Jun 25, 12:10 UTCJun 25, 14:34 UTC2h 25m
2026-06-22 SCX8938 MSP → BED Jun 22, 21:59 UTCJun 23, 00:09 UTC2h 10m
2026-06-22 SCX8907 - Jun 22, 16:14 UTCJun 22, 20:55 UTC4h 40m
2026-06-21 SCX8922 AEX → MSP Jun 21, 16:14 UTCJun 21, 20:05 UTC3h 50m
2026-06-20 SCX8951 SPI → BIF Jun 20, 22:35 UTCJun 21, 01:39 UTC3h 5m
2026-06-20 SCX1982 - Jun 20, 02:09 UTCJun 20, 04:29 UTC2h 20m
2026-06-19 SCX8172 GPT → ALB Jun 19, 23:29 UTCJun 20, 00:24 UTC55m
2026-06-19 SCX8172 GPT → ALB Jun 19, 21:44 UTCJun 19, 22:24 UTC40m
2026-06-19 SCX8171 ACY → MCN Jun 19, 18:34 UTCJun 19, 19:54 UTC1h 20m
2026-06-19 SCX8170 PHL → GPT Jun 19, 16:04 UTCJun 19, 16:49 UTC45m
2026-06-19 SCX1981 - Jun 19, 12:39 UTCJun 19, 14:39 UTC2h 0m
2026-06-18 SCX604 PHX → MSP Jun 18, 23:45 UTCJun 19, 02:19 UTC2h 34m
2026-06-18 SCX603 MSP → PHX Jun 18, 19:25 UTCJun 18, 22:15 UTC2h 50m
2026-06-18 SCX1058 BUF → MSP Jun 18, 16:15 UTCJun 18, 18:10 UTC1h 55m
2026-06-18 SCX1057 MSP → BUF Jun 18, 13:30 UTCJun 18, 15:00 UTC1h 30m
2026-06-17 SCX346 MCO → MSP Jun 17, 19:25 UTCJun 17, 22:35 UTC3h 10m
2026-06-17 SCX345 MSP → MCO Jun 17, 15:05 UTCJun 17, 17:45 UTC2h 40m
2026-06-16 SCX408 SAN → MSP Jun 16, 00:35 UTCJun 16, 03:50 UTC3h 15m
2026-06-15 SCX407 MSP → SAN Jun 15, 20:04 UTCJun 15, 23:25 UTC3h 20m
2026-06-15 SCX568 JFK → MSP Jun 15, 16:19 UTCJun 15, 18:50 UTC2h 30m
2026-06-15 SCX567 MSP → JFK Jun 15, 12:30 UTCJun 15, 14:34 UTC2h 5m
2026-06-14 SCX1836 SAT → MSP Jun 14, 23:54 UTCJun 15, 02:10 UTC2h 15m
2026-06-14 SCX520 CUN → SAT Jun 14, 16:30 UTCJun 14, 22:10 UTC5h 40m
2026-06-14 SCX1835 MSP → SAT Jun 14, 12:10 UTCJun 14, 14:45 UTC2h 35m
2026-06-13 SCX784 SJU → MSP Jun 13, 22:45 UTCJun 14, 01:45 UTC3h 0m
2026-06-13 SCX784 SJU → MSP Jun 13, 20:35 UTCJun 13, 20:45 UTC10m
2026-06-13 SCX783 MSP → SJU Jun 13, 18:35 UTCJun 13, 18:55 UTC20m
2026-06-13 SCX783 MSP → SJU Jun 13, 14:15 UTCJun 13, 16:30 UTC2h 15m
2026-06-12 SCX1492 CMH → MSP Jun 12, 22:15 UTCJun 12, 23:50 UTC1h 35m
2026-06-12 SCX1491 MSP → CMH Jun 12, 19:35 UTCJun 12, 20:55 UTC1h 20m
2026-06-12 SCX266 - Jun 12, 15:20 UTCJun 12, 17:55 UTC2h 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 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 10h 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, SCX520, SCX1836.