Your best bet would be to plug your iPad or phone in via HDMI. Then you should be able to play your iTunes content on the screens. You'll need to pick up a Lightning to HDMI adapter if you don't already have one. I'd also recommend using an HDMI cable with a right angle end so that it's not sticking out as far from the seat when it's plugged in.
Lightning Digital AV Adapter - Lightning to HDMI - Apple