Thanks for the responses to my question. We are back from our Chicago trip. We flew ONT to PHX, then to ORD(changed planes). Coming back ORD to DFW, then DFW to ONT(changed planes). On one of the flights going - and on one coming back - we had new aircraft. Coming back, on ORD to DFW - our aaircraft was one year old. It had screens/monitors in the back of every seat - AND - it had power charging outlets at every seat. A small green light designated the outlet. I think the plane was a 737. We were in basic/economy seats. I might add - on the ORD to DFW leg -the seats were roomier than on the DFW to ONT.