Boeing 737

In this Monday, March 11, 2019 file photo, a Boeing 737 MAX 8 airplane being built for TUI Group sits parked in the background at right at Boeing Co.’s Renton Assembly Plant in Renton, Wash. The Transportation Department confirmed that its watchdog agency will examine how the FAA certified the Boeing 737 Max 8 aircraft, the now-grounded plane involved in two fatal accidents within five months. The FAA had stood by the safety of the plane up until last Wednesday, March 13, 2019 despite other countries grounding it. (AP Photo/Ted S. Warren, File)