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.
The airline was established on 20 June 1967 as Southwest Air Lines(南西航空,Nansei Kōkū?), and started operations in July 1967. It changed its name in July 1993. It has 754 employees (at March 2007) and is owned by Japan Airlines (51.1%), Naha Airport Terminal (17%), Okinawa Prefecture (12.9%) and others (19.1%)
On 26 August 1982 a Boeing 737-200 operating as Southwest Air Lines Flight 611 overran the runway at Ishigaki Airport and was destroyed. None of the 138 passengers and crew were killed but some were injured during the emergency evacuation.