Boeing Co. posted its largest-ever quarterly loss on Wednesday, diving nearly $3 billion into the red as it wrestles with a longer-than-expected grounding of its best-selling 737 Max.

The world's largest plane-maker also reported a fresh delay on its 777X widebody program as engine problems pushed the first flight into 2020 and it warned of possible further delays.

Chief Executive Dennis Muilenburg said on a conference call after reporting quarterly results that the company could consider further 737 production cuts as the Max crisis drags on.