Southwest Airlines began serving Lubbock on May 20, 1977 as an intrastate airline with Boeing 737-200s to Dallas Love Field, Houston Hobby Airport, San Antonio, Corpus Christi and Harlingen. By 1978 Southwest had added nonstop 737 jet flights to El Paso in addition to nonstop jets to Dallas Love Field and Houston Hobby Airport and direct jets to other Texas cities. In 1983 Muse Air McDonnell Douglas MD-80s were flying nonstop to Dallas Love Field, Houston Hobby Airport and Los Angeles (LAX). American Airlines and Delta Air Lines were serving Lubbock by 1985, both flying nonstop to Dallas/Fort Worth Airport (DFW) and Amarillo, American with 727-200s and Delta with 737-200s. That year Aspen Airways BAe 146-100s and Convair 580s were flying direct from Denver via Amarillo. In 1989 American, Delta and Southwest flights continued, joined by America West Airlines Boeing 737-200s nonstop from Phoenix and Midland/Odessa.