Hint: Alliance in the air.
Answer: Star Alliance
Quoting Govind Prasad Sahu, who quotes Wikipedia.
Star Alliance is the world's first and largest airline alliance. Founded in 1997, its name and emblem represent the five founding airlines, Air Canada, Lufthansa, Scandinavian Airlines System, Thai Airways International, and United Airlines. Star Alliance has since grown considerably and now has 26 member airlines. Three more airlines are expected to become members in 2010. Star Alliance is headquartered in Frankfurt am Main, Germany.
