As Companhias Aéreas, or airlines, are companies that provide air transport services for passengers and cargo. They operate aircraft to connect different destinations, offering various classes of service, such as economy and business. Airlines can be classified as full-service carriers or low-cost carriers, depending on the range of services they provide. These companies manage flight schedules, ticket sales, and customer service. Major Companhias Aéreas often belong to alliances, which allow them to cooperate with other airlines for better connectivity and shared benefits. Examples of such alliances include Star Alliance and Oneworld.