Double or full beds are 15 inches wider than twin beds at 54 inches wide and 75 inches long, but if two share the bed, each has only 27 inches of personal space, much less than a twin.

Singapore Airlines now has first-class, fully flat double beds in “Suites,” which could put it in the lead for helping passengers fly in comfort.

Lufthansa unveils its new first-class suites for long-haul flights, including some with double beds. Its CEO said the suite "conveys the feeling of privacy and individuality similar to a hotel room." ...