that's what they want. that's what they hope. >> they do want to fight the americans mainly on their own turf. in this regard, isis has a different dream than al qaeda. osama bin laden wanted to perpetrate large-scale terror attacks against the west. but he did not want his own state. isis does and it uses its caliphate as a base to launch its terror attacks. the best way to understand the difference between the two groups is to go back to al qaeda's signature moment, its most spectacular attack. ♪ september 11th, 2001. 19-year-old operatives hijack four planes, knock down two skyscrapers, crash into the pentagon and kill almost 3,000 people. >> the people who knocked these