I am unable to edit a tail number that I input. I input it as EMB-145 for the type, and when I import my trips, it imports the type as E145. In order to keep things consistent, I went back to the one tail number that had EMB-145 for the type to edit it, and was unable to. When I try to delete the tail and start over, it tells me that I cannot delete an aircraft type that has been previously flown. Same thing with "Unidentified" type. That was entered in error for one tail and I am unable to delete it as a type. Please help!