US Airways is adding nonstop seasonal service to Charlotte Douglas International Airport from four European cities. The company will fly to CLT from Barcelona, Spain, Brussels, Belgium, Lisbon, Portugal, and Manchester, England, starting in the spring. US Airways currently flies to those airports from its Philadelphia hub. The Charlotte routes will supplement that service, US Airways said. The flights to Charlotte from Barcelona, Lisbon and Manchester will begin May 22; the Brussels flight will launch June 5. The Barcelona flight will run through Oct. 24, the Lisbon and Manchester flights through Sept. 28, and the Brussels flight through Sept. 1.