Spirit Airlines Official Site welcomes you. We would like to take this opportunity to announce that Spirit Airlines has won the tag of being the world's most economical airline. With a seamless network to more than 18 countries and dense connectivity within the far-reaching areas and regions in the US, Spirit Airline has revolutionized the air reservation system. What started in 1980 in the form of a small airline, now has become a leader in the aviation industry. Spirit Airline flight reservation system is available in the services of the people of the US, Mexico, Caribbeans, Latin American, and South American countries.