"He forced the pilot of AeroMexico Flight 576 from Cancun to circle Mexico City seven times before landing, and demanded to talk to Mexican President Felipe Calderon. 'He had a revelation that Mexico was threatened by an earthquake,' said public safety minister Genaro Garcia Luna. The hijacker released all 104 passengers unharmed before SWAT teams stormed the plane, freeing the crew and capturing Pereira without firing a shot."
So he was only a lunatic. But he showed us that it's still pretty easy to hijack a plane.