What letter must appear at the beginning of the registration number of all non-military aircraft in the U.S.?
Aircraft registration ZK-Gxx. In the United States, the registration number is commonly referred to as an "N" number, because all aircraft registered there have a number starting with the letter N. An alphanumeric system is used because of the large numbers of aircraft registered in the United States. An "N-number" begins with a run of one or more numeric digits, may end with one or two alphabetic letters, may only consist of one to five characters in total, and must start with a digit other than zero. In addition, "N-numbers" may not contain the letters "I" or "O", due to their similarities
Aircraft registration being extended, leaving aircraft from both SARs with registration marks of only four characters, as opposed to the norm of five. Aircraft registration Every civil aircraft must be marked prominently on its exterior by an alphanumeric string, indicating its country of registration and its unique serial number. This code must also appear in its Certificate of Registration, issued by the relevant National Aviation Authority (NAA). An aircraft can only have one registration, in one jurisdiction. In accordance with the Convention on International Civil Aviation (also known as the Chicago Convention), all civil aircraft must be registered with a national aviation