https://www.reuters.com/article/us-ethiopia-airplane-congress/u-s-transport-chief-asks-why-some-boeing-safety-features-not-included-idUSKCN1R81MT >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.