I have seen it once before, and occasionally one is changed to GTMO001 where they usually use the last 3 digits of the reg. #.

The GTMO BE20 was on 21st March 2022.

Also got a Gulfstream on 11th March 2022.

Have several ss of GTMO001, last was 4/5th May. First was 16th Feb 2022.

19th & 20th April 2023 with GTMO845

There was a C130 hanging around with them too. Lots of comms in Mil planes!

One coming from Jamaica direction 26th March 2023.

001 was with 842 on 9th Nov 2022.

001 with the other two, one at Panama 3rd March 2023.