^ that's way too confusing if they don't know SQL, and they can really mess it up if they make errors.
Best bet is to make an excel spreadsheet with the headings along the top row:
icao, name, fullname, registration, downloadlink, imagelink, range, weight, cruise, maxpax, maxcargo, minrank, ranklevel, enabled
In the next row add the data for one registration of an aircraft type and then copy the row, changing the registrations. Repeat for the other type.
Save as a csv, import to the aircraft table using the import tab, choosing csv as the file type.