aircrafts are not fully loaded to maximum capacity with fuel unless the planned route is going to be close to the maximum range of the aircraft. and the
757/767 has several variations. the one in use at that time would have been the -200 with max fuel capacity of just under 11,275gal (77,121lbs) with a range of about 2700miles.
that document arbitrary used the maximum amount of fuel for the larger 767 aircraft which is incorrect @ 90,770L
aircraft are allotted fuel for taxi, take off and to reach cruising altitude, the majority of fuel is used here as the engines are working the hardest, once cruising altitude is reached they are throttled back and the total weight of the plane decreases as the trip progresses. fuel usage is about 20K/lbs and hour for the first 1/2 of the trip then drops to about half for the 757 with more fuel and a longer range obviously for the 767 and variant.
avg flight times from Logon to LA is 5.5-6hrs. the max fuel reserve is between 25k-40k/lbs depending on the type of aircraft.
http://www.boeing.com/commercial/startup/pdf/historical/757f_perf.pdf
based on your information 43,490L (11,275gal) with maximum fuel on a 757-200 that would be 1524759.4MJ or 1524.7GJ which would reduce that to the maximum of 364 tons of TNT and then much less after compensating for the fuel that was burned in the fireball when it was vaporized upon impact.
and just to stir the post some more I will through this in there. since we know that an airplane did not hit the Pentagon and did not crash in PA, what other lies has the government told us? we know the the premise for the war was bogus and the only WMD that's Saddam ever had were the ones that we sold/gave to him in the 80's and Bin Laden denied being involved in 9-11 from jump.
what many don't know is that 3rd generation uranium weapons have been in use on the battlefield for quite some time. depleted uranium (DU) is used in a variety of warheads and is used in shaped charges. the symptoms of many first responders in NYC are the same as those in the middle east that have been exposed to uranium dust particles.
Under the radar: identifying third-generation uranium weapons
http://unidir.org/pdf/articles/pdf-art2759.pdf
and the source is below.
UNIDIR - Article
Depleted Uranium Contamination: A Crime against Humanity