FILE - In this Friday, Sept. 11, 2020 file photo, a plane takes off from Washington Reagan National Airport as a large U.S. flag is unfurled at the Pentagon ahead of ceremonies at the National 9/11 Pentagon Memorial to honor the 184 people killed in the 2001 terrorist attack on the Pentagon, in Washington, Friday, Sept. 11, 2020. (AP Photo/J. Scott Applewhite, File)