I've never tried traveling wearing a VR headset, but I did get a Legion Go that I like to use in that scenario. It's basically a Steam Deck with a nicer screen, more powerful GPU, and shit battery that needs to be constantly charged.
As I learned when I tried to charge it with a 140W Apple charger, planes have current limitations. If you plug in too high of a wattage charger, it can totally disable the power socket.
One of the dances to figure out if you're going to use a VR headset on a plane is how high a wattage can the plane constantly support. Then again, you probably don't want your face physically tethered to the middle seat anyway.