This Federal Register notice would clarify, through an interpretive rule, existing statutes, regulations and FMCSA policies related to the determination of: (1) interstate commerce in the context of highway transportation of passengers immediately prior or subsequent to air transportation; and (2) for-hire transportation of passengers by motor carriers. Under certain conditions, motor carriers performing intrastate movements of passengers immediately before or after interstate air travel do not need FMCSA operating authority registration. However, such motor carriers are operating in interstate commerce and, unless otherwise exempt, are subject to applicable FMCSA regulations. The interpretative rule would confirm and clarify for motor carriers of passengers and the public FMCSA's interpretation of applicable regulations and requirements. The statutes, regulations, and policies are currently in effect.