Hi Willem
I have created a profile for the Boeing 737.
If a profile already exists in the database and you need to create a new one with the same tail number, this can be done via the profile page.
On the left handside of the page, below where it says 1 aircraft record found there is an option to Add another LX-LGU
Click on the link and it will take you to the Add New Aircraft Data page
regards
Chris