Indeed the media are primed by our spooks about aviation criminal threats however it’s almost certainly not the prime target to be honest.
The capacity of many groups simply isn’t at the levels of suffisication some journalists would have you believe imho.
Specifically in the case of ISIS where there pernicious methods and cell structures well not even cell structure often lone wolves seem to fail constantly (the British spooks are doing a grand job in degrading them from within btwJ
They haven’t even got the ability to produce an effective explosive device beyond a simple kettle bomb.
Those chemical liquids based bomb ideas are vapour and simply haven’t been demonstrated to work have they aside from one laptop attach in East Africa that killed the criminal and little damage.
All said some groups certainly get publicity via aviation threats even through they probably can’t deliver !
Imho those Islamic groups we all here about are technologically far behind what ETA and the IRA were able to achieve some decades ago however the real concern and risk from them is the total ramdoness of rather simple acts of violence using realily has available materials combined their own death cult !