Boeing’s latest 737 MAX crisis deepened on Monday after United Airlines said it had found loose bolts on multiple grounded MAX 9 aircraft, raising new concerns among industry experts about how its best-selling jet family is manufactured. U.S. regulators grounded 171 of the 737 Max 9 aircraft after a panel blew off an Alaska Airlines-operated plane flight not long after taking off from a Portland, Oregon, airport on Friday, forcing pilots to scramble to land the plane safely.
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