Boeing says working with regulators for return of 737 MAX "We are working hard, guided by the regulators to make improvements and changes to the airplane," says Randy Tinseth, vice president of marketing at Boeing Commercial Airplanes, at a press conference at the Dubai Airshow. The 737 MAX has been grounded since March following the second of two crashes which left a combined total of 346 people dead. IMAGES AND SOUNDBITES