ok, thanks for the info, yes, US planes similarly have their Bu number (USN/USMC) or serial number (USAF) on their fuselage somewhere, separate from their squadron ID.
i'm just used to calling the squadron IDs borts, due to DCS.
would be nice if we could affect the serials as well in the mission editor, as it always looks a little funny to have multiple airframes with the same serial number flying around