With that kind of thinking there would be no market for ocean cruise ships - but there is :)
Perhaps people could be convinced to take an "air cruise", though it'll never have the amenities of a ship, but as transportation there's very little room for slower and more expensive.
Slow float over Mt Everest.
Not really. It was comfortable if you had first class seating--at a price above today's business class. But the first class lounge was fairly lightly used for the most part and became business class seating when that level of service came in. While airports are worse in some ways because they're often so crowded, modern international lie-flat business class seating is more comfortable in general--and there are more entertainment options--than first class on Pan Am was.
> Just six foot?
The average height for men in the US is 5'9" [1]. The Netherlands is the world's tallest country with an average height of 5'11" [1].
[1] https://www.healthline.com/health/average-height-for-men#u-s...
Given your stats that you're provided and I'm choosing to assume are true, then I'm abnormal but it does not change my experience on average. Hopefully the increasing obesity issue will cause some ancillary changes that may benefit tall people at the same time some day. At least let me pay for it, you know?