An American Airlines Boeing 737 Max 8 aircraft from Los Angeles approaches to land at Washington Reagan National Airport in Washington D.C., the United States on March 13, 2019. The United States is grounding all Boeing 737 Max 8 and 9 aircraft, said U.S. President Donald Trump Wednesday, as the country becomes the last major country to do so after two crashes by the model in recent months. (Xinhua/Ting Shen)