In late 2004, after negotiations with the County, Northwest Airlines agreed to add Northwest Airlink service to Detroit Metropolitan Wayne County Airport, which began on May 2, 2005. US Airways nonstop service to Pittsburgh resumed on November 9, 2005 but stopped again on April 1, 2006 due to low use. (Pittsburgh is a US Airways focus city.) Passenger traffic improved with the additional service; the airport served about 140,000 passengers in 2004, increasing to around 170,000 in 2007.