Fort Worth, Texas-based American Airlines, Atlanta, Georgia-based Delta Air Lines, Long Island City, New York-based Jet Blue Airways, Dallas, Texas-based Southwest Airlines and Chicago, Illinois-based United Airlines are each seeking routes abandoned by Denver, Colorado-based Frontier Airlines and Fort Lauderdale, Florida-based Silver Airways, and Miramar, Florida-based Spirit Airlines; and Memphis, Tennessee-based Federal Express Airlines is seeking a daily cargo operation from Miami International Airport to Jose Marti International Airport (MIA-HAV):

http://www.cubatrade.org/blog/2017/3/13/frontier-airlines-ending-mia-hav-route-on-4-june-2017?rq=Frontier%20Airlines

http://www.cubatrade.org/blog/2017/3/13/silver-airways-suspending-cuba-service-on-22-april-2017-may-seek-frontiers-mia-hav-route?rq=Silver

http://www.cubatrade.org/blog/2017/4/15/spirit-airlines-is-third-us-carrier-to-cease-us-cuba-operations?rq=Silver

Previously, Southwest Airlines discussed reducing and/or eliminating service from the United States to the Republic of Cuba.

http://www.cubatrade.org/blog/2017/5/19/southwest-airlines-ceo-speaks-of-pulling-the-plug-on-non-havana-flights?rq=Silver

Jet Blue Airways is seeking a new route, one that it first sought in 2016, from Logan International Airport in Boston, Massachusetts, to Havana, Republic of Cuba:

http://www.cubatrade.org/blog/2017/4/22/what-does-jetblue-know-or-doesnt-know-seeking-additional-routes-to-cuba?rq=Silver

If granted, the flight will have symbolism for the Trump Administration:

http://www.cubatrade.org/blog/2017/5/18/nez9vv71hkndkzexqe9nfgmq8u2ish?rq=Jet%20Blue

The Consolidated Replies by the airlines as submitted on 26 September 2017 to the United States Department of Transportation (Order by DOT):

American Airlines
Delta Air Lines
Federal Express Corporation
Jet Blue Airways
Southwest Airlines
United Airlines (joint with Mesa Airlines)