HONG KONG Cathay Pacific raced on Wednesday to replace a faulty engine part that has forced it to ground its A350 planes and other airlines around the world to do their own safety checks. Cathay, one of the largest operators worldwide of the A350 jetliner, grounded its 48-plane fleet of the aircraft on Monday after a Zurich-bounded flight was forced to return to Hong Kong over an "engine component failure." The airline has so far canceled nearly 70 flights, with mainly regional routes including