AB meaning in Transport & Travel ?

Air Berlin PLC & Co. Luftverkehrs KG (FWB: AB1), branded as airberlin or airberlin.com was a major German airline. At its peak, it was Germany's second-largest airline, as well as Europe's tenth-largest airline in terms of passengers carried. It was headquartered in Berlin and had hubs at Berlin Tegel Airport and Düsseldorf Airport. It was a member of the oneworld airline alliance.

The airline was founded in 1978 by an American company named Lelco to provide airline service to West Berlin, a territory that could not be served by West German airlines such as Lufthansa due to restrictions on East German airspace. Following the reunification of Germany, Air Berlin was sold by Lelco to German interests in 1991. It joined the Oneworld alliance in 2012. After years of losses, Air Berlin filed for insolvency on 15 August 2017 and ceased operations on 27 October 2017.