I admitted that even the best insulation might not have kept the buildings from collapsing. Even Shuttle tile starts soaking through at some point. I don't know how long the fire would have burned had the buildings stayed up. Hours? Days?

What kind of fire extinguishing system could handle jet fuel? Water doesn't work. You can't fill a building with foam as a primary fire suppression system. Maybe an emergency one to backup standard sprinklers. I don't think Halon would work, and besides the environmentalists have pulled Halon off the market. Is it even a real issue for real buildings? Do you hang hundreds of tons of foam equipment on a building on the chance someone may fly an airplane into it? On the other hand, the millions of extra dollars may mean billions in rent over the building's lifetime from tenants soothed by the suppression system's existence.

Airline companies are having similar problems sweating over fitting antimissile systems onto their airliners at millions of dollars per plane. Crap, we can't even get them to routinely equip passengers with smoke hoods, a proven lifesaver.

A quick survey: would an airline company equipping its planes with all kinds of scary disaster proofing, like smoke hoods, missile spoofers, and other such things, make you more or less nervous about flying that airline?