Final answer:
A provisional airport is an airport approved by the Administrator for use by an air carrier certificate holder to facilitate air transportation and support the development of a civil airline infrastructure.
Step-by-step explanation:
A provisional airport is an airport approved by the Administrator for use by an air carrier certificate holder for the purpose of facilitating air transportation. It is a temporary airport that is granted approval for a certain period of time in order to assist in the development of a civil airline infrastructure. Provisional airports play a crucial role in supporting the growth of commercial passenger air traffic by providing necessary facilities such as terminals for efficient boarding of airplanes and handling of luggage.