So far, this is only a concept, but it looks promising!
According to CNN Travel, planes could be arranged with 2 rows of 2 and have another cabin over those rows of seats. The weird part is that since the upper row is inside seats, they can't really have windows so instead there are virtual windows. Virtual windows are already a thing in luxury suites for high end travel.
By having the cabin above the other seats, the airlines would theoretically be able to have more seats on each plane so that should be a huge benefit to them.
Much more on this at CNN.com
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