Southwest Airlines has requested authority from the US Department of Transportation (DOT) to operate flights between Washington National airport and Kansas City from January 2014 when Frontier Airlines ceases service on the route.
Southwest plans to operate daily service on the route using two within perimeter slots at the slot-controlled Washington National airport from 6 January 2014, it says in its application to the DOT.
Most flights out of the airport have to be operated within a 1,250 mile (about 2,012km) perimeter.
Frontier has indicated it will withdraw flights from the route after 5 January 2014, says Southwest. Southwest plans to operate 143-seat Boeing 737-700 aircraft on the flights, which will offer significantly more seat capacity than Frontier's Embraer 190s currently being operated on the route, it says.
US Airways also operates non-stop between Washington National and Kansas City, while United Airlines offers service between Washington Dulles and Kansas City, schedules in Innovata show.