BusinessEtihad Airways becomes biggest shareholder in Air BerlinShahid AbbasiDecember 20, 2011December 19, 2011 by Shahid AbbasiDecember 20, 2011December 19, 2011 Karachi: Etihad Airways has agreed to increase its stake in Air Berlin, Europe’s sixth largest airline, to 29.21 per cent, becoming AirBerlin’s largest single shareholder....