How fires brought down the twin towers.
FACT.the collapses started where the fuselages ended up.
FACT.the towers were designed to withstand an impact of a boeing 707 flying slow(180mph),lost in the fog,LOW ON FUEL looking for an airport.
IF THE PLANE HAD ENOUGH FUEL IT WOULD FLY TO ANOTHER CITY.
thats why no calculations regarding the fuel.
what burns hotter: an office building or a big jets fuselage?