14 CFR 204.1: Purpose.

This part sets forth the fitness data that must be submitted by applicants for certificate authority, by applicants for authority to provide service as a commuter air carrier to an eligible place, by carriers proposing to provide essential air transportation, and by certificated air carriers and commuter air carriers proposing a substantial change in operations, ownership, or management. This part also contains the procedures and filing requirements applicable to carriers that hold dormant authority.