United Airlines offers connectivity across more than 360 destinations in 58 countries across 6 continents. United Airlines is one of the largest American carriers with four of its hubs located at major US cities of Washington, Chicago, Houston and San Francisco. The airline also uses Narita International Airport in Tokyo as its international hub while London Heathrow and Frankfurt are key airports that offer United’s passengers great connectivity throughout the world. United Airlines also offers flights in collaboration with its code share partners such as Jet Airways, Aer Lingus and Germanwings. United Airlines co-founded Star Alliance, the first-ever global airline alliance. Today, it is the largest alliance in the world and features Air Canada, Singapore Airlines and Lufthansa as its prominent members.