Alliances have become an important strategy for airlines to expand networks, enhance revenue, and reduce costs. Many airlines have entered strategic partnerships through major global alliances like Star Alliance, oneworld, and SkyTeam, which now represent over 60% of global air traffic. These alliances coordinate activities like scheduling, codesharing, frequent flyer programs, and more. However, greater integration is not always better, and airlines must evaluate the right level of partnership based on the potential value and costs for their unique business model and markets served.