Flyover around Washington D.C. salutes healthcare workers fighting COVID-19

A formation of the Thunderbirds and Blue Angels fly over Washington D.C. area, the United States, on May 2, 2020. The U.S. Navy's Blue Angels and U.S. Air Force's Thunderbirds honored frontline COVID-19 responders and essential workers with formation flights over here on Saturday. (Xinhua/Liu Jie)