Use of business names

This regulation governs how air carriers identify themselves on their aircraft.

First, certificate holders operating under Parts 121 or 135 can only use business names that are listed in their operations specifications—they can't make up marketing names or operate under unauthorized brands.

Second, every aircraft must clearly display either the certificate holder's name or their air carrier/operating certificate number on the outside of the aircraft. This identification must be legible and readable by someone standing on the ground (except during flight). The FAA must approve how this information is displayed.

This matters because it ensures accountability and transparency. Passengers, airport personnel, and regulators need to know which certificate holder is responsible for operating any given flight. The requirement prevents confusion about who's actually conducting operations and ensures proper oversight of commercial aviation activities.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*