Boeing’s reputation has taken a beating over the past few months as design and manufacturing issues have increasingly caused serious problems for the company’s jet liners. Now the head of a major international airline has warned that Boeing doesn’t have much runway left.

Sir Tim Clark, president of Emirates Airline, told the Financial Times that Boeing is in the “last chance saloon.” His comments came as his company’s engineers are planning to personally overlook Boeing’s manufacturing operations, which Clark said have deteriorated as the company has put profits ahead of “engineering excellence.”