Boeing may have to book billions of dollars in additional charges, two brokers said, following latest developments around the planemaker’s grounded 737 Max jet that calls into question the timing of the aircraft’s return to service.

Boeing shares fell as much as 3% yesterday after the US aviation regulator found a new flaw in the 737-Max jet, potentially delaying the aircraft’s return to service and piling more pressure on the planemaker’s suppliers.