Freedom of air refers to the right of airlines to fly across international borders without restrictions, granted by agreement between countries. Synonyms for freedom of air include open skies agreements, which allow airlines to operate freely between countries, liberalization of air transport, which removes government controls over airlines and airports, and deregulation, which reduces government intervention in the airline industry. These terms all describe the move towards a more competitive and market-based approach to air transport, which has resulted in increased choice, lower fares and greater innovation in the industry. The concept of freedom of air has helped to expand the global aviation market and promote economic growth around the world.