I have ADHD and am lucky enough to be able to dissocciate in certain situations instead of just going insane, but that doesn't sound like this is what they're going for. This is just a cultural madness and/or proof of the lizard people.
Eh, the hype around it maybe, but it can be a useful/unique experience for some - at least if you're not the type where it'd be acutely painful, in which case do whatever gets you through the flight/whatever.
Think about modern life - how often do you find yourself in a position where there are no acute demands, no expectations for how you need to spend your time, and you can just sit with your thoughts for a few hours? Unless you consciously carve out some time for that, IMO it's pretty rare. Multihour travel as a flight/train/bus passenger affords that time with no special effort.
I like at least attempting it for a chunk of the trip, if not the whole time - imagination starts running wild in cool ways, which otherwise doesn't happen as often as I'd like it to. Though in fairness, if it's a plane the cabin noise usually puts me to sleep during the attempt.
I'll put it this way - if you're the kind of person that finds the idea of isolation tanks appealing, depending on why you may enjoy raw-dogging flights or other passenger travel. 100% not for everyone though, and that's fine - different strokes and all that.
My tactic when meditating specifically is to imagine myself as a mountain. Any thoughts are just like clouds. Let them pass with the wind. It's ok to have them, but do not hold on to them. For the mountain is unconcerned by a cloud.
Have you ever tried doing a mindful activity, like mindful walking or mindful eating? You might find that one of those are your jam if you have a hard time by yourself! They give you an activity to focus on.
One of the important things in many kinds of meditation is it's not about stopping the bees, but noticing them.
I remember hearing about some Buddhist monk who was famed for his meditation. Someone asked him how long he could sit before his mind wandered "oh about seven seconds normally". He just got very good at noticing when his mind wandered and trying again.
That's what I've been calling it for years, funnily. Like, I don't practice meditation in general, but just letting time pass, chilling out, not focusing on anything to get into a state of mind that lets time flow faster, to me, has always been meditation.
I'm kinda laughing reading about this whole "raw dogging" thing. What a ridiculously macho way of talking about it.
I suppose they could call it "sitting to attention", maybe? Like a palace guard you know? If they wanted to sound more macho without actually sounding like a creep.
I don't really have any form to recomend because I don't follow any specific form and have developed my own based on my own experience and integrating anything that works for me personally
I'd suggest looking online and finding stuff that works for you and intergrate it into your meditation practice