Really I'm not into fearmongering but if what you want is downing an airplane then get an SA-18 and boom! Those things are frighteningly easy to get these days. Much more realistic than hacking into an airplane esp from remote.

I think you could hack into the airplane if you get to the right wires and those are not impossible to get to -- I remember reading how you could get to the satellite transponder from a cabinet close to business class on the MH370 -- but I would think that if someone walks to a cupboard, plugs in a laptop then the FAs will have a word or two with said person...

Edt: http://www.wired.com/2015/04/hackers...ssenger-wi-fi/ today.