Romli admits his concept is likely to be greeted with skepticism, not least from aviation safety authorities who would have to sign off on the concept.

Nevertheless, he believes that his vertical seating concept could win approval in five or six years.

"Airlines like to reduce operational costs and given this option, I believe they have a big interest for it as well.

"The only major challenge is to obtain the approval from the aviation authorities and if the concept has proven to satisfy all necessary requirements in terms of passenger safety, there shouldn't be much problem for it to become reality."