Sending typhoons to intercept passenger airliners is as pointless and fanciful as putting surface to air missile launchers on the roof tops of London flats during the Olympics. ..No western government in their right mind could ever sanction blasting hundreds of innocent passengers all over the English countryside! It's a ridiculous idea to think that democracy would allow that to happen, MH17 was apparently hit by mistake, just imagine the international reaction to targeted strike authorised by a civilised country against an aircraft registered in a different state! Wow the fall out would be too awful to imagine from every conceivable angle. Imagine the scenario...Captain deems the threat credible according to his/her Ops Manual Part A definition of credible and calls ATC who call in the typhoon. Typhoon pilot then instructs airline Captain to divert aircraft over a designated area for destruction!! Sorry chaps as fanciful as this threat might be i'm afraid that Mr typhoon is about as useful in this situation as doing nothing. If it were required for shooting up airliners it would position behind and above his target out of sight of passengers and crew. Remember Helios at Athens, that was intercepted and even though no one was flying it they left it alone to its own fate.