The arrest of a teenager who apparently intended to hijack a Southwest Airlines flight should remind us of the three groups of human threats posed to attack the air transport system: terrorists, criminals, and disturbed or disruptive passengers.

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Two other recent examples of disturbed young people who viewed aviation as a forum for their intentions:

2002 - Fifteen-year-old Charles Bishop deliberately crashed his general aviation aircraft into a downtown Tampa office building.

1999 ? It is revealed by law enforcement that Columbine High School gunman Eric Harris had developed extensive plans to hijack an aircraft and fly it into the Empire State Building.

A detailed report about aviation security concerns in Canada, particularly at Toronto's Pearson International, is raising eyebrows.

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