Thanks to deregulation, no-frills knock offs of Southwest take to the skies like crows. About 120 airlines have gone out of business or filed for bankruptcy since the industry was deregulated in 1978. American’s SABRE system optimizes...everything. It manages ticket pricing so flights are always full, and American is building new hubs and terminals. Meanwhile, Southwest company culture is shifting from sex appeal to backyard barbecue vibe. Is it enough to attract families to fly?