Very old-school RCA connectors and also old-school DIN (?) connector.

You could connect your iDevice using a special adaptor cable which at launch could be borrowed from the cabin crew.

This had Apple’s iPod/iPhone connector on one end and plugged into the round multi-pin socket, so you could send your iDevice's video to the bigger screen but also control video playback straight from your iDevice.

I tested this at launch, some pics below.