Summarize the following article: (At least 250 words)At Southwest Airlines, “We Love Your Bags”Although Southwest Airlines started small, today it is one of the largest airlines in the country, flying to 69 cities on more than 3,200 flights a day. The Texas-based company prides itself on its sense of humor and down-home attitude, which has been developed and advanced over the years through advertising, promotions, and public relations programs. Its national advertising campaigns (“You are now free to move about the country” and “We Love Your Bags”) are success stories. This is the airline that once paid an Elvis impersonator to serenade customers at the Manchester, New Hampshire, airport to celebrate its addition of flights to Las Vagas; the airline that paints some of its fleet in state colors, with its recent addition of Florida. One decorated with colors and symbols from the Florida flag. Southwest’s vision is to be a low-budget airline that enables its customers to have fun flying.