Nope. Nobody could EVER have imagined this happening. Unless.... of course...there was somebody in the White House or the military or Congress or the Senate, or the FBI or the CIA or the NSA or DEA or ATF or any other law enforcement agency, or any other branch of the government, or anyone at the airports or the airlines (or their parents or their wives or their kids or their friends or their neighbors) who watched television.
This pilot episode, a spinoff from the X-Files with the double entendre title of "The Lone Gunman", concerned a terrorist plot to fly a hijacked airplane into the World Trade Center Towers. It was filmed in New York between March 20 - April 7, 2000 and it aired in prime time on Fox on March 4, 2001.
BELOW: A CLIP FROM THAT EPISODE