Comment by somewhatgoated

I agree with you on train and somewhat bus but cars are extremely easy to weaponise and dirt cheap. Any terrorist trying to hijack a plane and not simply using a car (with or without extra explosives) is an idiot.

Essentially terrorism isn’t about spreading terror, because they are so laughably ineffective at it.

See this excellent gwern article: https://gwern.net/terrorism-is-not-about-terror