The number of passengers flying through Baltimore-Washington International Thurgood Marshall Airport rose 4.7 percent in 2010 to 21.9 million, setting an annual record, Gov. Martin O'Malley said Monday.
BWI Marshall has seen consistent growth in numbers of passengers since spring 2009. The airport had set eight consecutive monthly records as of December. Last year's passenger count broke the previous annual record of 21 million passengers in 2007.
Southwest Airlines, the airport's leading carrier, served more than 11.7 million passengers in 2010, a 7.4 percent increase over 2009. Southwest accounted for more than half the airport's passenger market share last year.