Having once legged it in the middle of the night myself from an african (controlled) airport in a largish noisy t.p., its easy to do but you still have to have the cooperation of some locals.either to get some gnd support (in our case a gpu)or bribe all the guards to clean their guns.nothing can happen without the local telegraph knowin about it.
thankfully the french foreign legion also there at the time werent briefed to lay down fire on civilian foreign aircraft.
no it wasnt nicked we were refused departure during the day due to politics and our vip needed out so we got out .
you had to be there.