FILE - In this Jan. 16, 2006 file photo, the tail of their plane appears outside the window as passengers line up to board their Southwest Airlines flight to Tulsa from Lambert-St. Louis International Airport in St. Louis, Mo. The Dallas-based discount carrier said Wednesday, Sept. 2, 2009, that for an extra $10 each way Southwest passengers can automatically reserve a boarding position prior to general check-in. AP Photo logo AP Photo 29 months ago

FILE - In this Jan. 16, 2006 file photo, the tail of their plane appears outside the window as passengers line up to board their Southwest Airlines flight to Tulsa from Lambert-St. Louis International Airport in St. Louis, Mo. The Dallas-based discount carrier said Wednesday, Sept. 2, 2009, that for an extra $10 each way Southwest passengers can automatically reserve a boarding position prior to general check-in.