14 C.F.R. § 91.713 Operation of civil aircraft of Cuban registry.
Title 14 - Aeronautics and Space
No person may operate a civil aircraft of Cuban registry except in controlled airspace and in accordance with air traffic clearance or air traffic control instructions that may require use of specific airways or routes and landings at specific airports.
Title 14: Aeronautics and Space
PART 91—GENERAL OPERATING AND FLIGHT RULES
Subpart H—Foreign Aircraft Operations and Operations of U.S.-Registered Civil Aircraft Outside of the United States; and Rules Governing Persons on Board Such Aircraft
§ 91.713 Operation of civil aircraft of Cuban registry.