"Terrorism" is too broad of a category, if we're going to be pedantic, Fuzzy. "Terrorism" may be a behavior and a process, but it's not limited to hijacking planes, or flying them into buildings as a suicide mission. You might say any black market syndicate uses "Terrorism" as a tactical tool for their own purposes (drug trafficking, sex trafficking, illegal border crossings, etc).

IMO it's silly to declare a War on certain things like the War against Drugs, or the War against Extremism. Especially since they're not really wars in the traditional sense. It's a misuse of the word War.