None at all will do just fine.
Look at how much damage the shoe bomber did to the air travel system. Far more infrastructure damage than just blowing up a plane would have been.
Prediction: Soon, a suicide bomber will swallow (a la drug dealer) his explosives and somehow be detected. Airports will close down and the land will be sold cheap.
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Sometime you the windshield, sometime you the bug, sometime you the driver you turn on the windshield washer you keep going.