Boeing's stock is down today primarily due to uncertainty around a major commercial deal. Turkish Airlines threatened to shift a provisional order for 150 Boeing 737 MAX jets to Airbus because of unresolved engine cost negotiations with Boeing's sole engine provider, CFM International. This concern overshadowed a new contract Boeing secured with the U.S. Air Force for additional MH-139A Grey Wolf helicopters. Investors reacted negatively to the risk of losing a significant commercial order despite the new military contract, causing the stock to fall over 4% today.
Additional background factors weighing on Boeing stock include ongoing challenges such as production delays, postponed aircraft certifications, and broader competitive pressures from Airbus, though these are more from prior months rather than today's specific drop.