Delta Air Lines, American Airlines, and Southwest Airlines have joined JetBlue Airways in applying to use the Havana International, Cuba frequencies set to be relinquished by Frontier Airlines and Spirit Airlines. The two Ultra Low-Cost Carriers (ULCC) have already confirmed their impending withdrawal from the Cuban market later this quarter citing insufficient demand.

In its application to the US Department of Transportation (DOT), Delta requested one daily US-Havana frequency for use in expanding its current daily Miami International-Havana service to twice-daily. If granted, service would begin no later than December 15, 2017, using A320 equipment.

In its application to the DOT, American Airlines requests a similar allocation, seven weekly US-Havana frequencies, so that it may operate an additional daily year-round service between Miami and Havana. American proposes to launch this service no later than October 5, 2017, using a B737-800.

And finally, in its application to the DOT, Southwest says it wants an extra daily Havana frequency to add to its existing double daily return service from Fort Lauderdale International to Havana. If granted Southwest said it would begin the added flights no later than November 5, 2017, using either 143-seat B737-700 or 175-seat B737-800 aircraft.