In first class you generally get 1-2-1, some Emirates planes have a 1-1-1, but they’re all still twin aisle. Is there any reason airlines haven’t attempted a 1-1 with a single aisle and made a massive “room” for First Class passengers?
In addition to the other answers, there is a point where the space available to a passenger is adequate, and adding more wouldn’t justify the additional cost to said passenger. I’m sure airlines have done extensive research on how much space people are willing to pay a premium for.
At some point they would buy a whole smaller plane
Fewer seats, fewer tickets, fewer dollars.
How fat do you have to be in order to need half of a jumbo-jet’s width just for yourself?
Cost.
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I just want to add on top of other replies, for people with that money that do want that kind of space, they would either hire or own a private jet.
