Boeing Co. may have to book billions of dollars in additional charges related to its grounded 737 Max jets, brokerages said, following reports that call into question the timing of the aircraft's return to service.
Credit Suisse and UBS downgraded the stock after reports Friday showed internal messages between two Boeing employees stating that the plane's anti-stall system behaved erratically during testing before the aircraft entered service.
The revelation poses fresh challenges for Boeing, which is reeling under pressure after two fatal crashes forced the company to ground the planes and book billions of dollars in losses.