Czech Airlines j.s.c. (abbreviation: ČSA, ) is the flag carrier of the Czech Republic. Its head office is located in the Vokovice area of Prague's 6th district and its hub is Václav Havel Airport Prague. The company mainly operates scheduled flights, serving four destinations as of 2023. When, in 2018, 97.74% of Czech Airlines was bought by the privately owned Smartwings, ČSA became a part of the Smartwings Group. The remaining 2.26% of ČSA was owned by insurance company Česká Pojišťovna. The airline runs a frequent flyer programme called "OK Plus" in reference to the airline's International Air Transport Association designation, as well as the term of approval; OK also featured prominently in its previous livery, and is the prefix of Czech Republic aircraft registrations. It is a member of the SkyTeam alliance. ČSA is the fifth oldest airline in the world, after Dutch KLM (1919), Colombian Avianca (1919), Australian Qantas (1920), and Soviet/Russian Aeroflot (1923). It was the first airline in the world to fly regular jet-only routes (between Prague and Moscow). ČSA filed for bankruptcy in March 2021 and went through an extensive business restructuring, exiting in June 2022. Currently, ČSA is under a new ownership structure with a new parent company called Prague City Air s.r.o. owning 70% of the company, with Smartwings retaining the remaining 30%. The airline currently operates flights to one destination. History Early years ČSA was founded on 6 October 1923 by the Czechoslovak government as ČSA Československé státní aerolinie (Czechoslovak State Airlines). Twenty-three days later, its first transport flight took place, flying between Prague and Bratislava. It only operated domestic services until its first international flight from Prague to Bratislava and on to Zagreb in Yugoslavia in 1930. After the dismemberment of Czechoslovakia in 1939 and the splitting of the country into three parts, the airline was dissolved. Following a coup in February 1948, the Czechoslovak Communist Party suspended some of ČSA's western European and Middle Eastern routes and also gradually replaced much of the fleet with Soviet-built airliners, due to the embargo imposed by the West on the western-built aircraft spares and other equipment. The Ilyushin Il-14 was updated and built under licence in Czechoslovakia as the Avia-14. In 1950, ČSA became the world's first victim of a mass hijacking. Three Czechoslovak Douglas DC-3 airliners flown to an American air base in Erding, near Munich, stirred the world on both sides