There are several synonyms for the term "major airline" that can be used to describe a large commercial airline company. Some of these synonyms may include "national carrier," "flag carrier," or "reputable airline." Additionally, terms like "legacy airline" or "full-service airline" might also be used to describe these well-established carriers. Major airlines are typically characterized by their extensive route networks, large fleets of aircraft, and significant market share in the aviation industry. They often offer a range of services and amenities to their passengers, including frequent flyer programs, lounges, and in-flight entertainment. Overall, major airlines play a critical role in the global travel industry and serve as a key mode of transportation for millions of people every year.