Hawaiian Airlines is increasing its checked-baggage fee 70 percent for the first piece of luggage on interisland flights to $17 from $10, effective Sept. 1.

All other baggage fees for travel on Hawaiian remain unchanged, the airline said Tuesday after announcing it lost $50 million in the second quarter, its first loss in three years.

Passengers exempt from the change are those who are members of Hawaiian’s Premier, Pualani Gold and Pualani Platinum clubs; corporate members who book their tickets through Hawaiian’s corporate portal; customers traveling in first class; active U.S. military personnel traveling on military or government fares; those with car seats, infant carriers or strollers when customers are traveling with a child; and those with wheelchairs, walkers, crutches, canes and other personal assistive devices.

Glenn Taniguchi, Hawaiian’s senior vice president of marketing and sales, said the change will be the first that Hawaiian has instituted for interisland service since September 2009.

"We have changed other fees in step with the rest of the airline industry but have held the line on interisland baggage fees for the past two years," he said. "Unfortunately, increasing costs of operation make this adjustment unavoidable. Our fees for interisland service remain lower than anywhere else in our system."