Boeing had another month of muted jet deliveries as it grappled with supplier issues, increased regularity scrutiny and its own efforts to improve quality. Deliveries to China also are on hold amid a Chinese review of the batteries that power the planes’ cockpit data recorder. The airplane maker delivered 24 jets in May, 19 of which were 737 MAXs. Boeing had hoped to be rolling out close to 40 planes a month by now before fallout from the Alaska Airlines door-plug blowout in January slowed production. Boeing booked four orders in the month, all for its 787-10 wide-body jet