CSA Czech Airlines a.s. is the national airline of the Czech Republic. Its head office on the grounds of Václav Havel Airport Prague in Ruzyne, Prague. CSA was the second airline in the world to initiate successful jet airliner services (in 1957 using the Tu-104) and simultaneously the first airline to fly regular jet-only routes (between Prague and Moscow). Today, it operates scheduled, charter and cargo services.