if entering the U.S. by air or sea must be:
Holding a return or onward ticket. If traveling on an electronic ticket, a copy of the itinerary must be carried for presentation to the immigration inspector. Travelers with onward tickets terminating in Mexico, Canada, Bermuda or the Caribbean Islands must be legal residents of these areas.

The alien is in possession of a round-trip transportation ticket (unless this requirement is waived by the Secretary of Homeland Security under regulations or the alien is arriving at the port of entry on an aircraft operated under part 135 of title 14, Code of Federal Regulations, or a noncommercial aircraft that is owned or operated by a domestic corporation conducting operations under part 91 of title 14, Code of Federal Regulations).