de reg -rereg
hi
Normally on the FAA Website you can scroll down the page and see previous
Registrations if Applicable . If you know the Current Reg you can look on website LAAS that will give you some history Example for
HB-IGM Gulfstream 550 5004 shows (ex N904GA) If you only have the
construction number you will be able to trace current Reg using that
Thankfully few country's allow use of old registrations G does not and looks
like never Will "unless you know Different"
you can GOOGLE for LAAS website not sure if allowed to post it here
so best not
Tony
farnborough