U.S. Transportation Secretary Elaine Chao said on Wednesday it was "very questionable" why some safety features were not required on the Boeing Co. 737 Max, ahead of a much-anticipated Senate hearing where leaders in her department will be questioned about two recent 737 Max crashes.
Chao stopped short of saying the government would require retrofitting all aircraft with new safety features.
"I don't think we are there yet, but it is very questionable if these were safety-oriented additions, why they were not part of the required template of measures that should go into an airplane."