As Southwest Airlines likes to tell it, the fourth-largest U.S. airline (in terms of domestic customers carried) started out with a cocktail napkin and a dream. Rollin King, owner of a floundering commuter airline, was sitting with his lawyer, Herb Kelleher, in a San Antonio bar when the two decided to start a new, short-haul air carrier. Southwest Airlines has beaten the odds by capitalizing upon unbeatable fares, no-frills in-flight service, and Kelleher's well-publicized zaniness (flight crews crack jokes while giving pre-flight safety instruction ...