FILE PHOTO: An aerial photo shows Boeing 737 MAX airplanes parked on the tarmac at the Boeing Factory in Renton, Washington, U.S. March 21, 2019. REUTERS/Lindsey Wasson/File Photo/File Photo

SEATTLE (Reuters) - The return of the Boeing Co 737 MAX to service in the wake of two deadly crashes will be paced by global regulators and customers, the planemaker’s top executive said on Wednesday.

“If there’s something that we can do to make airplane development programs or the certification process better and safer, we will pursue it,” Boeing Chief Executive Officer Dennis Muilenburg said on a call with analysts after the company reported quarterly results.