The number of available seats on nonstop flights departing from the U.S. mainland to Hawaii is forecast to grow 4.2% through the three-month period ending July 31.

Airlift to Hawaiian islands from U.S. states west of the Rockies, Hawaii’s largest source market, will likely increase 4.7% year-over-year through May, June and July, according to the Hawaii Tourism Authority’s latest air seat capacity outlook.

Seats from the U.S. East are expected to remain essentially unchanged, inching up less than a percentage point.

Bolstered by gains from both Canada and Japan, international seats to Hawaii are projected to increase 2.7% through the end of July.

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