Commonly held belief that the Payne Stewart aircraft would have been shot down. However, DOD denies that. Interesting that Canadian PM had authorized shoot down:
Assuming Wiki is correct.
https://en.wikipedia.org/wiki/1999_South_Dakota_Learjet_crash
There was some speculation in the media that the fighter jets were prepared to shoot down the Learjet if it threatened to crash in a heavily populated area.[citation needed] Officials at the Pentagon strongly denied that possibility. Shooting down the plane "was never an option," Air Force spokesman Captain Joe Della Vedova said, adding that "I don't know where that came from."[9]
Canadian Prime Minister Jean Chrétien authorized the Canadian Forces Air Command to shoot down the plane if it entered Canadian airspace without making contact. He writes in his 2018 memoirs, "The plane was heading toward the city of Winnipeg and the air traffic controllers feared that it would crash into the Manitoba capital. I was asked to give permission for the military to bring down the plane if that became necessary. With a heavy heart, I authorized the procedure. Shortly after I made my decision, I learned that the plane had crashed in South Dakota."[10]