Err, and so what about private, corporate and freighter jets – they gonna put sky marshals on them too ?
After all, many of them are full-blown airliners, often operated from airports where little or no checks on their passengers and / or crew and / or freight are undertaken.
Indeed do you know how much one can procure an airworthy B727 freighter for ? It's buttons !
E.g. Given the kind of funds that they have access to Johnny terrorist could easily procure an old ( but large ) jet aircraft then, sight unseen in some remote foreign airfield, he / she could fill it with as much explosive and / or nerve gas and / or neurotoxin etc as the ageing leviathan can stagger into the air with (after all, it's gonna be a one-way trip ), they then stooge their way over to (say) London, release the chemicals over the city, before crashing their aeronautical chariot into (say) the House of Parliament / Buckingham Palace / Everton Football ground ( on a Saturday avo ) in well publicised blaze of glory.
Once again, this must surely be a far simpler proposition than trying to commander a passenger airliner – so what’s being done about it ?......... where the answer is, as we all know, stuff all !
But why is this so ?
Would it perchance be that it’s basically too difficult to police ( read, ‘expensive’ ) and / or that there are no votes to be had in it ?!