Emirates executive takes a jab at Boeing, says quality control has been an ongoing issue

• An airline president took a shot at Boeing as the planemaker faces a new crisis over the 737 Max. 
• Tim Clark, president of Emirates, said Boeing has had quality control issues "for a long time now."
• 171 Boeing 737 Max 9 jets remain grounded pending inspections. 

In the wake of another plane model being grounded indefinitely, the president of one of the world's largest airlines isn't mincing words about jet maker Boeing.