I SAID THAT ABORTION WAS LEGAL BEFORE ROE V WADE.
http://southwest.com/about_swa/airborne.html
(near bottom of first screen)
1971
With President Lamar Muse at the helm, Southwest Airlines takes off on its maiden voyage and begins service between Dallas, Houston, and San Antonio. America's most unique airline is born.
Further, if you go down the page to 1982, you'll notice they didn't start serving to Vegas until that year:
1982
Herbert D. Kelleher comes aboard as permanent President, CEO, and Chairman of the Board for Southwest Airlines, and Southwest spreads its wings to San Francisco, Los Angeles, San Diego, Las Vegas, and Phoenix.
Perhaps you are thinking of another airline that ran women to Vegas for abortions, but it's not Southwest.