A record 2.22 million passengers flew through Baltimore/Washington International Thurgood Marshall Airport in July, a 0.8 percent increase to break the mark set in July 2011.

Southwest Airlines, BWI's largest carrier, served 1.29 million passengers in July, 6.8 percent more than a year earlier. International passenger traffic rose 17.3 percent in July to 70,376 passengers and cargo shipments grew to 9,972 tons, an increase of 2.1 percent.

This summer, the airport began two major projects: a $100 million upgrade of the oldest part of the terminal and a $40.3 million renovation of the longest runway. On Thursday, Spirit Airlines is scheduled to begin service to Dallas/Fort Worth and Fort Lauderdale.