He was wrong......... Besides big difference in a 707 and a 767....
Big difference, huh??
To summarize the aircraft:
The maximum takeoff weight for a Boeing 707-320B is 336,000 pounds.
The maximum takeoff weight for a Boeing 767-200ER is 395,000 pounds.
The wingspan of a Boeing 707 is 146 feet.
The wingspan of a Boeing 767 is 156 feet.
The length of a Boeing 707 is 153 feet.
The length of a Boeing 767 is 159 feet.
The Boeing 707 could carry 23,000 gallons of fuel.
The Boeing 767 could carry 23,980 gallons of fuel.
The cruise speed of a Boeing 707 is 607 mph = 890 ft/s,
The cruise speed of a Boeing 767 is 530 mph = 777 ft/s.
The Boeing 707 and 767 are very similar aircraft, with the main differences being that the 767 is slightly heavier and the 707 is faster.
Since the Boeing 707 had a higher thrust to weight ratio, it would be traveling faster on take-off and on landing.
The thrust to weight ratio for a Boeing 707 is 4 x 18,000/336,000 = 0.214286.
The thrust to weight ratio for a Boeing 767 is 2 x 31,500/395,000 = 0.159494.
In all the likely variations of an accidental impact with the WTC, the Boeing 707 would be traveling faster. In terms of impact damage, this higher speed would more than compensate for the slightly lower weight of the Boeing 707.
The 707s in use when the tests were conducted had a max take-off weight of 257,000 lbs ... about 40% less of that of the 767.
Guessing the speed which the study used or the max speed of the jets is irrelevant. Both buildings survived the impacts, just as the study projected.
So how hot and for how long was the "horrendous" fire in that study expected to burn?
You must now learn about the effects of fire on steel, and how steel spreads the heat to other attached parts of it, thus providing a cooling effect. There is no doubt that something provided the high temps required to destroy the steel at the WTC, but historically asymmetric office fires do not and never have cause such rapid, total global exploding collapses.
There have been other steel hirise buildings subjected to worse temps, for longer durations, that have never totally collapsed, producing rubble pile fires in excess of 12-15oo degrees that lasted for 100 days.
Now what was in those buildings that produced such extreme temps?