Oneworld (marketed as oneworld) is an airline alliance. It was founded in 1999. As of October 2017, Oneworld is the third-largest global alliance. It carried more than 527.9 million passengers, behind SkyTeam (630 million) and Star Alliance (762 million). Its headquarters are in New York City, United States. Its slogan is, ""An alliance of the world's leading airlines working as one.""