i understand the core of the twin towers but it was also had a stell grid system. Which is alot stronger than a plane. You talk about the core, how come the core disolved in the collapse yet the periphery was still in place?It's not really irrelevant when it's propelled at speed at a building - it's inherent to its 'weakness' in that context or lack thereof.
Also, why do you think the wing cuts through the structure? You realise the steel structure was at the building's core rather than around its periphery right?