Where did those terrorists learn to fly those planes?

How did they learn how to get access to those flight schools?

hmm. That's a tough one. Wonder if they consulted Mr Google?

I doubt that Mr. Google would tell then exactly what techniques they needed to study in order to crash a plane it a buildling, or could provide them with the logistical knowledge necessary to penetrate airport security or the tactics needed to stage the onboard coup. If you know about such websites, however, it's quite possible they are sponsored by the KGB.