With connections on UA through ORD or IAD, UA metal flights have for quite some years offered outlets for laptops in C class but sometimes they are inoperative. I sometimes go in Y and I have never noticed them but of course there are always exceptions to the rule. If I were you, I would check
www.seatguru.com or contact UA. Regarding Jet Air, I am not familiar with the airline.
Have a great trip and enjoy the movies----