The problem here is that I've yet to see a dated publication prior to 9/11 warning of the danger of airliners being flown into skyscrapers. Somebody may indeed have foreseen this, but I suspect its mostly hindsight genius.
The closest I've seen to prediction of this disaster was in a Tom Clancy novel, when a Japanese radical flies a plane into the Capitol during the State of the Union address. But that was a cargo plane.
Nothing public. Thee are guys who used to work for the alphabet agencies.