Aircraft owners can register for an FAA N-number through the mail or online. To request a reservation for an N-number, first select a minimum of five N-numbers in order of preference. Read through the FAA's rules regarding the formation of an N-number before listing your preferences.
Prior to selecting the N-number, check the Federal Aviation Administration website for the availability of the number. After selecting the numbers, include your name, mailing address, phone number, signature along with the N-numbers in a document. Also, provide a check or money order for the required amount to the Federal Aviation Administration. Send the information to the FAA's mailing address available on the website.
To register an N-number online, navigate to the FAA Registry Aircraft N-Number Reservation Web page. Enter five numbers in order of preference in the fields provided, or use the option of reserving N-numbers ending with any two specific digits. Click the Proceed with Request button when ready. The FAA then requires you to verify the N-number reservation information and make a payment with a credit card. Note that requesting reservation from the site does not guarantee the reservation. Processing the requests occurs in the order of receipt, so there is a possibility that the selected numbers are already in processing.