Somewhere in the thread it says that Qantas knew the passenger. I assume that nothing bad actually happened? Does anyone know what precautions were taken by Qantas on board? Does anyone have any information to indicate that there is a risk to allowing deranged people to fly? Is it legal to prevent deranged people from flying? (Deranged airline employees (pilots and others) have arguably caused almost as many passenger deaths as all terrorists combined). Just some random thoughts.