Airline alliances are partnerships 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 global reach without having to operate flights to every destination. Passengers benefit from earning frequent flyer miles across member airlines and enjoying coordinated services, such as easier check-ins and baggage transfers, enhancing their travel experience.