A family of General Electric engines widely used on Boeing Co. commercial jetliners and some Airbus planes should be inspected more than twice as often as federal regulators are requiring, the National Transportation Safety Board said Monday. The warning comes only a week after the Federal Aviation Administration ordered U.S. airlines to inspect the engines more frequently after one exploded on an American Airlines jet that was on the ground in June, sending a 50-pound piece of metal more than a half mile across Los Angeles International Airport. Had that engine explosion occurred in flight, the NTSB said, the plane...