AIRLINES

Southwest Airlines to Add Flights: The carrier said it will use new Boeing 737s and 737s acquired in its purchase of Morris Air to add 26 round-trip flights to its schedule between May 26 and July 8. The airline also recently announced new service to Seattle; Portland; Spokane, Wash., and Orange County starting in early June. New nonstop routes from Baltimore include St. Louis; Louisville, Ky., and Birmingham, Ala. By June 6, Southwest will also more than double its daily nonstop flights between Chicago’s Midway Airport and Baltimore, from three to seven.