You can plug its battery to a USB port while using it (according to Apple) so since most plane have charging ports next to every seat it doesn't look like battery capacity will be an issue on (most) planes. Just keep it plugged in while using it.

Those USB ports probably don't supply more than 5W. You almost certainly need a full 120V outlet. These do exist on planes, though, just not all.

I’ve used a laptop off of one and was at 100% at the end of the flight. This probably wildly varies by plane. This won’t use more energy than a laptop

Wow really? I'm genuinely shocked (pun not intended).

It's one more thing that makes it unlike a phone or a laptop with a long battery life. (Haven't had one of those since my netbook fell apart)

The Hololens 1 has the problem that it does not work outside in the day at all, it is just not bright enough to compete since it works by adding to (not subtracting from) light from the outside world. Inside the house though it can put "holograms" in all but the brightest places. No way I am installing Microsoft Streets & Trips on it and using it to navigate on foot or in the passenger seat of a car.

The Apple Vision will do better outside. For years I've been dreaming of making an Iron Man Halloween costume with a passthrough VR setup, even though I anticipate I'd need to have a handler to stay safe. I guess if I don't do it this year I won't get to do it before it becomes passe.

If it's a long-haul (14h, above) flight, they're almost always there. And if you're plonking down $3.5k for an AVP, chances are you're flying business, which (again, long-haul) is a pod of your own. Definitely there, then.

Not to mention, this is an M2 device, it'll sip power.