High Quality Content by WIKIPEDIA articles! 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. Alliances also provide convenient marketing branding to facilitate travelers making inter-airline codeshare connections within countries. This branding goes as far as to even include unified aircraft liveries among member airlines.