A British judge will on Tuesday rule whether Airbus must keep building A321neo jetliners for estranged Qatar Airways in a decision with implications for future multi-billion-dollar jet deals, as their public bust-up returns to London’s High Court. Airbus revoked the A321neo deal in January in retaliation for Qatar’s refusal to stop taking A350s in a separate legal and safety dispute over damage to the surface of the larger jets. The knock-on decision to cancel the A321neo deal alarmed some airlines, with the head of the International Air Transport Association describing it as a “worrying” deve…