Southwest Airlines will serve four Hawaiian destinations when it begins flying to the islands either late this year or sometime in 2019.

Along with Honolulu, the carrier will fly to the Big Island, Maui and Kauai.

"While we do not yet have details to share on exact dates or routes, they do represent our initial footprints and top priorities for the soonest service in the State of Hawaii," the carrier said.

Southwest announced last October that it planned to begin flying to the 50th state. Along with flights from the U.S. mainland, the carrier has held out the possibility of flying intra-island routes.

On Thursday, Southwest repeated its previous assurances that Hawaii tickets will go on sale this year, even if flights don't begin until next year.

The carrier also said it is has entered into a deal with Alaska Airlines to lease 12 daily landing rights at capacity-constrained New York LaGuardia and eight slots at capacity-constrained Washington Reagan National.

Southwest hasn't said where it will fly from those airports.

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