MEMBER ALERT: AOPA is closed today, Dec. 10, due to inclement weather and will reopen Dec. 11 at 8:30 a.m. Eastern.
Most aircraft are required to have N numbers, or "markings," at least 12 inches high. Here is a summary of the rest of the required physical attributes of the markings, as well as a list of those aircraft exempt from the 12-inch requirement.
Click here for information about changing or reserving your N number.
Applicable Code of Federal Regulations (CFR) 14 CFR Part 45, Identification and Registration Marking, prescribes the requirements of aircraft registration numbers.
For most fixed-wing aircraft, the marks must meet the following requirements:
Note: No person may operate an aircraft under the exceptions listed below if one or more of the following apply:
The following aircraft may display marks at least 2 inches high:
The following aircraft may display marks at least 3 inches high:
All aircraft penetrating an air defense identification zone (ADIZ) must have markings at least 12 inches high, at least temporarily. Using 2-inch-wide electrical tape is an acceptable method to temporarily display the aircraft's registration markings.
AOPA thanks our members for their continued support in protecting the freedom to fly.