Boeing said it could stop production of the 737 Max aircraft after the company reported losses of $2.9bn in the three months to the end of June.
It is the largest ever quarterly loss and follows two crashes involving the 737 Max plane.
In comparison, Boeing reported a profit of $2.2bn for the same period last year.
Chief executive Dennis Muilenburg said production of the plane could be slowed or halted if regulators do not move to lift the ban on the 737 Max, which was the company’s best-selling aircraft.
The entire fleet was grounded in March after crashes in Indonesia and Ethiopia.