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If we're talking about carried out threat and not achieved aims: there were more than those two flights and more than those two buildings targeted. And even if you are talking about achieved aims only: the Pentagon was hit as well if you are forgetting that or maybe that just belongs in the '~'. In fact more than two buildings in NYC itself were destroyed, even if only two there were targeted.
The seat of the main elected branch of government (US Capitol) was targeted and likely would have been struck without the passenger interventions (fighter jets had been sent out towards the atlantic ocean and FAA had not yet ordered all planes grounded even if NORAD had been alerted by that point). We were very lucky passengers and crew had made airphone calls and some disallowed cell phone calls to get enough critical mass to fight back.
I think the subsequent war on terror, used to invade Iraq without any relation to the attack, was terrible, but this kind of deflation is pretty insane to read.