Personally, I would think providing extra security to the PM would be paramount in this time of war. Ever hear of the saying: "penny wise and pound foolish"?
He would get all the security needed whether he flies commercial or special chartered plane. The only thing where I may go along with him travelling by charter is that of the inconvenience to others on the commercial flight. However unless he pays for the chartered plane I will go with the inconvenience for others.