US Airways Group, Inc. (US Airways Group) is a holding company whose primary business activity is the operation of a network air carrier through its wholly owned subsidiaries, US Airways, Inc. (US Airways), Piedmont Airlines, Inc. (Piedmont), PSA Airlines, Inc. (PSA), Material Services Company, Inc. (MSC) and Airways Assurance Limited, LLC (AAL). During the year ended December 31, 2008, passenger revenues accounted for approximately 91% of the Company’s operating revenues. Cargo revenues and other sources accounted for 9% of its operating revenues in 2008. US Airways Group had approximately 55 million passengers boarding its mainline flights in 2008. During 2008, its mainline operation provided regularly scheduled service or seasonal service at 135 airports. During 2008, the US Airways Express network served 187 airports in the United States, Canada and Latin America, including 77 airports also served by the Company’s mainline operation.