Which major global alliance is United Airlines part of?

United Airlines is a founding member of the Star Alliance, which is one of the world's largest global airline alliances. This alliance allows member airlines to collaborate in several key areas such as code-sharing flights, facilitating easier connections for travelers, and providing a network of benefits to customers. By being part of Star Alliance, United Airlines can offer its passengers access to a vast network of destinations, streamlined travel experiences, reciprocal frequent flyer benefits, and coordinated schedules with other member airlines. This enhances customer convenience and satisfaction, making the alliance an essential aspect of United Airlines' international operations.