By Tim Hepher LONDON (Reuters) – Airbus and Qatar Airways fought in court in front of Boeing on Friday as a dispute over damage to A350 jets descended into a tug-of-war over confidential documents while the sums at stake in their unprecedented falling out topped $1.5 billion. Boeing was dragged into the case for the first time as lawyers quarrelled over access to a preliminary contract for its 737 MAX jets – illustrating the domino effect on a $150 billion global jetliner industry from the rare London legal battle. Qatar Airways is suing Airbus in a division of the High Court over damage to th…