Have any of you traveled on a Boeing 787 Dreamliner?
Does the onboard radio/TV connect with an adapter with two 3.5 mm jacks as in the picture below or does it have a conventional adapter?
'Entertainment is provided by BA's fleet-wide entertainment system and Club World passengers get a 12.1-inch personal in-flight entertainment touchscreen with noise-cancelling headphones. They'll also get a UK/US/EU power socket, two USB sockets, and a Video RCA connection in order to use their own digital equipment to play back on the screen. Nice.'
Take a look at the website.
Hope this helped.
The type of headphone plug used varies based on the individual airline, and occasionally even varies between planes on that airline.
There are generally 3 types of sockets used :
There used to be a 4th type which was dual-3.5mm sockets, plus a smaller power socket, but I haven't seen these used for many years.
The best option is to carry an adapter like the one shown with you. Some airlines will provide the adapter with their headphones - this is really intended just so that they can distribute the same headphones regardless of which plane type you are on, however there is nothing stopping you from using that adapter with your own headphones.