If you knew anything of what you are arguing about, you would know that the exterior of the WTC contributed to about 10% of the support of the structures. Structurally, the towers are built around a central collumn in the middle of each that supports the entire building. Those "enormous holes" don't really mean jack shit.
As described before, commercial airliners are relatively light for their size. A steel frame wrapped with, no lie, 1/8 inch alluminum and plastics. Crashing through the exterior, the planes caused little damage to the internal supports that bear the majority of the structure.
I also like to point out how high the towers were actually hit. If the north tower was about 100 feet shorter, the damn plane would've only clipped off the antennae. And even the south tower was only hit 1/3 of the way down from the top. The majority of the building's weight is below the site of initial collapse.
And I would like to briefly talk about the fire. Notice in the picture above a great portion of the jet's fuel explodes outside of the south tower. Therefore reducing the amount inside the building to burn. Yet if fire really brought these buildings down... the south tower was the first to collapse. ALSO regarding the fire. If any of you have taken collegiate general chemistry you would be aware of the different types of flames. Jet-burner, pre-mixed, and Diffuse flames. Combustion requires 3 things, a fuel, oxidant, and a source of initial activation energy. In a diffuse flame, the fuel and the oxidant are not mixed before ignition, but flow together in an uncontrolled manner and combust when the fuel/oxidant ratios reach values within the flammable range. A fireplace flame is a diffuse flame burning in air, as was the WTC fire. Diffuse flames burn the lowest temperatures of all flames.
Due to the large amounts of black smoke emitted from the towers, this would also indicated that the fires were oxidant (oxygen) deprived. Black smiths used blowers to force new air into fires to allow them to become hotter to make iron more workable. When a fire is oxidant deprived it incompletely burns at lower than normal temperature and carries excess fuel in the form of soot with it. This makes me even wonder if the 9/11 Commission's report of max temperature of 1832 F is even correct. I have a hard time believing the fires achieved a temperature of over 1000 F or so. Due to the conditions at play in the towers.