Japan Transocean Air Co., Ltd. (日本トランスオーシャン航空株式会社, Nippon Toransuōshan Kōkū Kabushiki-gaisha), or JTA, is an airline based in Naha, Okinawa Prefecture, Japan. It operates domestic services. Its main base is Naha Airport. From 1967 until 1993, the airline was known as Southwest Air Lines.