AirTran Airways, a subsidiary of AirTran Holdings Inc., on Thursday announced a 48-hour sale for travel to and from Baltimore/Washington International Thurgood Marshall Airport.The fares are available for purchase only through Friday. They are good for travel through Oct. 27 on every day of the week except Sundays.Fares start at $49 one-way to Atlanta, Charlotte, N.C. and Dayton, Ohio and range up to $169 for flights to Aruba.