Which type of aircraft can use 2-inch letters for registration marking?

Exhibition aircraft are allowed to use 2-inch letters for their registration markings. The regulations for marking aircraft registrations are more flexible for aircraft used primarily for exhibitions, which can afford to have specific exceptions compared to other aircraft categories. This is particularly relevant for the purpose of obtaining a special flight authorization or during airshows where visibility requirements can differ.

Other categories of aircraft, such as corporate, commercial, and military, typically have more stringent regulations that require larger lettering for their registration markings, often to ensure visibility and compliance with safety and identification standards consistent with more regular aviation operations. Therefore, exhibition aircraft enjoy this distinctive allowance which aligns with their unique operational and regulatory context.