To register a civil aircraft in the United States, the owner files an application with the FAA Aircraft Registration Branch in Oklahoma City under 14 CFR Part 47, pays a $5 fee, and receives a Certificate of Aircraft Registration tied to a unique N-number.1Federal Aviation Administration. Aircraft Registration The applicant has to be a U.S. citizen, a permanent resident alien, or a qualifying U.S. entity, and the aircraft itself has to be a civil aircraft, which federal law defines simply as “an aircraft except a public aircraft.”2Office of the Law Revision Counsel. 49 USC 40102 – Definitions Registration is one of two documents that must be on board every flight; the other is the airworthiness certificate. More than 220,000 civil aircraft are currently registered in the country, and the rules below apply to all of them.
What Counts as a Civil Aircraft
Federal law defines a civil aircraft by exclusion: anything that isn’t a public aircraft is civil. Public aircraft generally means those used exclusively by the federal government, owned and operated by a state or local government, or exclusively leased by a government entity for at least 90 continuous days. Military aircraft and those chartered by the armed forces also qualify as public. Unmanned aircraft owned or exclusively leased for at least 90 days by an Indian Tribal government fall into the public category as well.
Government-owned aircraft can slip out of public status. Once they carry passengers or property for compensation, or carry anyone other than crewmembers and certain authorized personnel, they no longer count as public. The statute ties public status to specific governmental functions such as national defense, law enforcement, search and rescue, firefighting, and biological or geological resource management.3Office of the Law Revision Counsel. 49 USC 40125 – Qualifications for Public Aircraft Status Everything outside that box, from a two-seat trainer to a widebody jet, is civil and has to be registered.
Who Can Register an Aircraft
Not everyone is eligible. Federal law limits U.S. aircraft registration to U.S. citizens, permanent resident aliens, and certain qualifying entities.
Individual U.S. citizens certify their citizenship on the registration application. Permanent residents provide the alien registration number issued by the Department of Homeland Security.4eCFR. 14 CFR 47.7 – United States Citizens and Resident Aliens Partnerships can register only if every partner is a U.S. citizen. Aircraft co-owned (but not held as a partnership asset) by resident aliens can still qualify.
Corporations face additional tests. To register directly, a company must be organized in the United States, have a U.S. citizen as its president, have at least two-thirds of its board of directors and officers be U.S. citizens, be under the actual control of U.S. citizens, and have at least 75% of its voting interest held by U.S. citizens. Foreign-owned companies that can’t clear those thresholds typically use a non-citizen trust: title is transferred to a U.S. citizen trustee, who registers the aircraft in the trustee’s name, and the trust agreement is filed with the FAA as a matter of public record.
How Registration Works
Registration is governed by 14 CFR Part 47 and administered by the FAA’s Aircraft Registration Branch in Oklahoma City.5eCFR. 14 CFR Part 47 – Aircraft Registration The initial fee is $5 per aircraft.1Federal Aviation Administration. Aircraft Registration
One point that trips people up: the registration certificate is conclusive evidence of the aircraft’s nationality for international purposes, but it is not evidence of ownership. Federal law explicitly states that registration cannot be used to prove who owns the aircraft in any legal proceeding.6Office of the Law Revision Counsel. 49 USC 44103 – Registration of Aircraft Ownership is established through bills of sale and title documents. When an aircraft is sold, the transfer must be documented on an Aircraft Bill of Sale (AC Form 8050-2) and submitted to the Aircraft Registration Branch, and the buyer files a new registration application.7Federal Aviation Administration. Aircraft Bill of Sale (AC Form 8050-2) Sellers who don’t report the transfer can remain legally associated with the aircraft after it changes hands, which creates liability exposure.
N-Number Display Rules
Each registered aircraft receives a unique identifier beginning with the letter “N,” which denotes United States registration. The N-number must be permanently displayed on the aircraft’s exterior in Roman capital letters that contrast with the background and remain legible.
Placement depends on aircraft type. On fixed-wing aircraft, the marks go on either the vertical tail surfaces or both sides of the fuselage between the wing’s trailing edge and the horizontal stabilizer. Rotorcraft display the marks on both sides of the cabin or fuselage. Balloons, airships, and other aircraft types each have specific placement rules under 14 CFR Part 45.8eCFR. 14 CFR Part 45 – Identification and Registration Marking
Renewal and Address Changes
A registration certificate expires seven years after the last day of the month in which it was issued. Owners have to renew before that deadline to keep flying legally.5eCFR. 14 CFR Part 47 – Aircraft Registration
Owners must also report any change of mailing address to the FAA within 30 days. Letting an address go stale is more common than people expect, and it causes real problems when the FAA sends renewal notices or airworthiness directives that never reach the owner.
Registration Is Not Enough: The Airworthiness Certificate
A Certificate of Aircraft Registration doesn’t make an aircraft legal to fly on its own. The aircraft also has to hold an Airworthiness Certificate under 14 CFR Part 21, which confirms it meets the design and safety standards for its type.9eCFR. 14 CFR Part 21 Subpart H – Airworthiness Certificates Only the registered owner or an authorized agent can apply for one, so registration comes first.
Unlike the registration certificate, a standard airworthiness certificate has no set expiration date. It stays valid only as long as the aircraft is maintained in airworthy condition. In practice, every civil aircraft not operating under a progressive inspection program must receive an annual inspection within the preceding 12 calendar months.10eCFR. 14 CFR 91.409 If the annual lapses, the aircraft is grounded until a certified mechanic inspects it and approves it for return to service. Both the airworthiness certificate and the registration certificate must be carried on board during every flight.
Penalties for Flying Without Valid Registration
Operating a civil aircraft without valid registration carries both civil and criminal consequences.
On the civil side, the FAA can assess penalties of up to $75,000 per violation against companies. Individuals and small businesses face a lower cap of up to $10,000 per violation for registration-related offenses involving aircraft not used for air transportation.11Office of the Law Revision Counsel. 49 USC 46301 – Civil Penalties
The criminal side is heavier. Knowingly operating an unregistered aircraft, displaying a false registration mark, or forging registration documents is a federal crime punishable by up to three years in prison. If the violation is connected to drug trafficking, the maximum climbs to five years, served consecutively with any other sentence.12Office of the Law Revision Counsel. 49 USC 46306 – Registration Violations Involving Aircraft Not Providing Air Transportation The FAA can also suspend or revoke pilot certificates independently of any criminal prosecution.
Drones Have Their Own Registration Track
Small unmanned aircraft systems are civil aircraft, but they don’t follow the Part 47 process described above. Recreational flyers must register any drone weighing more than 0.55 pounds (250 grams). Recreational registration costs $5 and covers every drone in the owner’s inventory for three years. Commercial and government operators flying under Part 107 must register every drone regardless of weight, at $5 per aircraft for three years. Drones over 55 pounds go through a separate, more involved registration process.13Federal Aviation Administration. How to Register Your Drone
Registered drones also have to comply with Remote ID, which broadcasts identification and location during flight and functions like a digital license plate. Compliance means flying a drone with built-in Remote ID, attaching an aftermarket broadcast module, or operating without Remote ID only inside an FAA-Recognized Identification Area.14Federal Aviation Administration. Remote Identification of Drones The FAA can assess civil penalties up to $27,500 for failing to register a drone.15Federal Aviation Administration. Is There a Penalty for Failing to Register