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I think that would end up being quite space inefficient, as people tend to be > 3 time taller than they are wider.

Isles are 31 inches apart, but seats are only ~17-18 inches wide. Stacking 3 tall gives you ~17.5 x 3 * 31 square inches. If you give 20 inches for bunk width that's 6'8" for bunk height which works out.

I don't think you could safely stack three of these, but it's going to be more comfortable on long flights.

> I don't think you could safely stack three of these

They could be attached to each other and the roof as well.

I am more concerned with people exiting quickly in an emergency. It might work if everyone was a fit 20 something who practiced it. But, many people would have issues even in normal boarding, crawling over people with a carbon filled with smoke would be a real challenge.

It's not substantially different than a current row of packed seats, especially when leaning back.

It might be even easier to stand up with a good design.

I'm thinking same floor space but extending upward in third dimension.

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