A ground crew walks near a Boeing 737 Max 8 plane operated by Shanghai Airlines parked on the tarmac at Hongqiao airport in Shanghai, China, Tuesday, March 12, 2019. U.S. aviation experts on Tuesday joined the investigation into the crash of an Ethiopian Airlines jetliner that killed 157 people, as a growing number of airlines grounded the new Boeing plane involved in the crash. (AP Photo)
A ground crew walks near a Boeing 737 Max 8 plane operated by Shanghai Airlines parked on the tarmac at Hongqiao airport in Shanghai, China, Tuesday, March 12, 2019. U.S. aviation experts on Tuesday joined the investigation into the crash of an Ethiopian Airlines jetliner that killed 157 people, as a growing number of airlines grounded the new Boeing plane involved in the crash. (AP Photo) AP
A ground crew walks near a Boeing 737 Max 8 plane operated by Shanghai Airlines parked on the tarmac at Hongqiao airport in Shanghai, China, Tuesday, March 12, 2019. U.S. aviation experts on Tuesday joined the investigation into the crash of an Ethiopian Airlines jetliner that killed 157 people, as a growing number of airlines grounded the new Boeing plane involved in the crash. (AP Photo) AP