Southwest schedules extra summertime flights out...

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Southwest Airlines Co. is acting on high hopes for this summer’s travel season out of Baltimore/Washington International Thurgood Marshall Airport. The Dallas-based airline, which uses BWI as a major hub, announced Monday morning that it plans to add extra daily nonstop flights to six existing routes starting in June. Southwest (NYSE: LUV) is also scheduling additional Saturday flights to five existing cities. The additional flights mean passengers will have more options to choose from when booking…