Hawaiian Airlines and JetBlue said Tuesday they are expanding their code-share agreement to allow travelers from dozens of cities, most of them in the eastern U.S., to easily connect to Hawaii via Boston’s Logan International Airport when the state’s largest carrier begins service from there in April.

Boston-area JetBlue customers can now purchase tickets on Hawaiian’s nonstop flight to Daniel K. Inouye International Airport with JetBlue’s “B6” code and earn TrueBlue points when they fly.

Additionally, travelers originating in 26 cities — including Washington, Pittsburgh, Philadelphia, Baltimore and Cleveland, which currently cannot connect to Hawaii through JetBlue in New York — already can purchase code-share tickets that carry Hawaiian’s “HA” code on their JetBlue flights that connect in Boston, and JetBlue’s “B6” code on Hawaiian’s new nonstop flight between Logan and Honolulu.