After merging with American Airlines in late 2013, US Airways Group soars as one of the world's leading passenger carriers. US Airways serves more than 330 destinations, mainly in the US and Canada, but also in Latin America, the Caribbean, the Middle East, and Europe. It uses about 340 jets on mainline routes; regional service is provided by subsidiaries Piedmont Airlines and PSA with more than 90 aircraft. US Airways extends its network via the Star Alliance, a marketing and code-sharing partnership led by US Airways, United Continental's United Airlines, Lufthansa, and Singapore Airlines. (Code-sharing allows airlines to sell tickets on one another's flights and thus offer more destinations.)