I'm sorry, there's no real threat? Lack of intelligence supporting a specific threat is very different from a general threat. Is the supposition here that because we don't know if anyone is currently targeting aviation that we shouldn't defend against those threats? Even if those threats existed in the near past?
I guess I'm not tracking the conclusion that there is no real threat. So there's no current intelligence showing any specific plots exist. That's good. Have there been plots in the past? Yes. Why did they stop? Does this mean there won't be any in the future?
Perhaps because airliners are a pITa to target? Is the threat actor really gone? Are they targeting something else?
I guess I find it hard to believe that the kind of wackjob so we've seen out there are suddenly kicking back and have retired from the terrorist scene. If the threat actor is still there, and previously target aviation, why did they stop?