Tom Clancy predicted terrorists would fly planes into buildings in 1994's Debt of Honor, which ended when a plane was flown into the Capitol building, killing the President and most of Congress
It seems that between 1994 and 2001, if somebody took this work of fiction seriously, they might have thought to either secure cockpit doors and/or change the operating procedure in the case of a hijacking. Obvously, the first change was suggested in a governmental report, but it was killed by Gore in exchange for campaign contributions from the airline industry.
My question is, was there ever any discussion of changing the was airlines respond to hijackings prior to 9-11?