A Global Airline Alliance is a partnership between multiple airlines that work together to provide better services to their customers. These alliances allow airlines to share resources, such as airport lounges and flight schedules, making it easier for passengers to connect between different airlines. Major alliances include Star Alliance, Oneworld, and SkyTeam. By joining an alliance, airlines can expand their network without having to operate additional flights. This collaboration helps reduce costs and improve efficiency, benefiting both the airlines and their passengers. Travelers can earn and redeem frequent flyer miles across member airlines, enhancing their travel experience.