After the September 11 attacks in 2001, T. F. Green Airport, like most airports in the United States, faced a temporarily decrease in passengers and fewer flights from American Airlines (which once flew to Chicago O'Hare and Dallas/Fort Worth Airport), Spirit, and SATA. Until the 2015 finalization of the merger between American Airlines and US Airways, creating one single licensed carrier under the American Airlines name, the Providence metropolitan area was the largest MSA in the United States not served by American Airlines or any of its subsidiaries. The decrease in service was especially severe to Chicago O'Hare as between both United and American decreased the number of one way daily seats from nearly a combined 1,400 to today's 225 daily one way seats. Nine flights of 727, 735, 757 and MD-80 service to today's regional jet use. Since the HNTB-designed Bruce Sundlun Terminal opened in 1996, T. F. Green became more congested due to increased traffic and post-9/11 security changes. Renovations followed, including expansion of baggage rooms to accommodate a new In-Line Explosive Detection System (EDS) Baggage Handling System, expanded security screening checkpoints, more concessions and ticket counters, and expansion of RIAC offices on the second and third floors.