Given 30 square feet per rack (which includes aisle ways, door swing space, etc), the 40 racks would require 1, 200 feet of floor space.

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And the end of each aisle - the "impulse buy" space - is also stacked with cans of lager and cider, so selecting and purchasing alcohol is just part of the weekly shop rather than something that we have to think about doing.

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For Delta, which eliminated international first class years ago, the new herringbone layout yields 48 business-class seats on the Boeing 747, 17 fewer in the same amount of space as the older design, which didn't have horizontal flat beds and direct aisle access for every passenger.

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