Tom Clancy and 9/11

How many times have we heard the question: "How could we possibly have known that terrorists would use an airliner as a weapon against us?"

However in Tom Clancy's book Debt of Honor, published in 1994, a 747 was flown into the capitol building killing the president and all of Congress.

Has anyone heard any talk that would suggest that Al-Qaeda might have gotten the idea from Clancy's book? I haven't, but the connection is obvious.

Any thoughts?