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What I understand is that background checks of every traveler is absolutely necessary for safe flights. Is this what you say?

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I'm with you. Someone could cause a huge amount of death, damage and destruction by blowing up a bus or subway train, and yet these have zero security and work just fine. How come everyone gets hysterical when it comes to flying?

I generally agree with you, but the justification is basically the 9/11 effect:

If a bomb goes off in a subway train or bus, the people in that vehicle die. If an airplane crashes into a building, significantly more people could die.

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