Boeing CEO Kelly Ortberg warned during a Thursday conference that the Dow Jones manufacturer is behind on FAA certification requirements. This announcement carries significant weight for investors watching the aerospace giant’s regulatory and production timelines.

Boeing is reportedly in talks to secure a landmark sale of up to 500 planes to China, with some estimates placing the potential value at $37 billion. The move could mark a dramatic turnaround for the U.S. aircraft manufacturer, which has faced challenges in maintaining its foothold in the critical Chinese market.