- Czech Airlines, also known as ČSA, is the national flag carrier airline of the Czech Republic. It was founded in 1923 and is one of the five oldest airlines in the world. Czech Airlines operates both domestic and international flights, covering destinations in Europe, Middle East, and Asia. The airline is based at Václav Havel Airport Prague and has a fleet of mainly Airbus aircraft. Czech Airlines offers services such as economy and business class cabins, in-flight entertainment, and a frequent flyer program called OK Plus.