Southwest Airlines begins sales for major Hawaii expansion starting in January

A Southwest Airlines Boeing 737 takes off. (Courtesy photo)

Southwest Airlines executives Laurie Barnett, left, Adam Decaire and Sonya Lacore answer questions in a talk story session earlier this year at the Westin Hapuna Beach Resort. (Laura Ruminski/West Hawaii Today)

HONOLULU — Southwest Airlines is aggressively expanding service to the Hawaiian islands in January, more than doubling the number of its interisland seats and increasing its trans-Pacific seat capacity by 50%.