gine Boeing 757 planes for the Lexington-to-Vegas flights, but Allegiant wants those aircraft for flights to Hawaii.The company began flights between Lexington and Las Vegas in November and the service will end on April 7. Customers with reservations beyond that date will be contacted by Allegiant for a full refund.The company will continue its flights from Lexington to Fort Lauderdale, Fort Meyers, Orlando and Tampa.