Delta Air Lines and US Airways announced on Wednesday that they would swap a number of takeoff and landing slots at La Guardia Airport and Ronald Reagan National Airport in Washington.

Delta said it would create a domestic hub at La Guardia, and some industry analysts said the deal would make Delta more of a powerhouse in New York and US Airways more of a powerhouse at Reagan.

Both airlines said they would continue their shuttle flights from La Guardia to Washington and Boston. But the shuttles would trade terminals at La Guardia once the deal is completed. The Delta shuttles, which now originate from the Marine Air Terminal at La Guardia, would move to the Delta terminal at the other end of the airport. US Airways would take over the Marine Air Terminal according to a newsitem in The New York Times.

Delta, which currently has 16 gates at La Guardia handling 148 departures a day, said it would have 27 gates and 272 daily departures after the deal is completed. It said that it expected to double the number of destinations to which it flies from La Guardia and that it would add service to more than a dozen cities that US Airways has not served from La Guardia. Delta would not name the cities.

US Airways said it would operate up to 72 flights a day from La Guardia, about two-thirds fewer than it currently operates. It said that besides the shuttles, it would fly from La Guardia to two cities in North Carolina — Charlotte, one of its major hubs, and Wilmington — and two in Pennsylvania — Philadelphia, also a major hub, and Pittsburgh.

US Airways said that it would add 15 new destinations from Reagan National, including 8 that currently have no daily nonstop service from that airport.