Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. An airline alliance is an agreement between two or more airlines to cooperate on a substantial level. The three largest passenger alliances are the Star Alliance, SkyTeam and Oneworld. Alliances also form between cargo airlines, such as that of WOW Alliance, SkyTeam Cargo and ANA/UPS Alliance. Alliances provide a network of connectivity and convenience for international passengers and international packages.