Friday marks the 25th anniversary of the deadliest terrorist attack in U.S. history. Nearly 3,000 people were killed on September 11, 2001, in attacks on New York City, the Pentagon, and aboard hijacked Flight 93 that crashed in Pennsylvania but was headed toward the U.S. Capitol. News networks were live that morning and covered the attacks as they unfolded. Anchors first told viewers that a plane had hit one of the Twin Towers in Lower Manhattan at 8:46 a.m. ET. Reporters were on the phone with