The second largest airline in Germany Air Berlin was established in 1978. It operated both international and intercity flights. Air Berlin offered its passengers really cheap flights, and from 2012 it has been a member of the oneworld network, one of the three largest air alliances in the world. Importantly, Air Berlin cooperated on a code share basis, including with airlines such as British Airways, American Airlines and Finnair. Low cost Air Berlin airlines flew to the USA, European countries and even to the east. The IATA code is AB.