That's the Go to pish. Aye he must be a maniac if he doesn't believe what the Yanks government tells you.
Both did withstand plane strikes. Both towers were designed to withstand three times the damage a 707 plane strike would cause them because that is the tolerances the engineers built into them. How do they know a bridge will hold a truck? Because engineering is clever that way. They know fings. That is why you don't mind crossing bridges when your on the bus on the way to collect your doctors line for another 3 months of benefit.
No it wasn't. No ship has ever been designed to be unsinkable. That was just what daft ****s like you were told and believed it because you soak up all the **** that's fed to you.