Source: Airbus/US Patent and Trademark Office

Airbus is at it again. The aircraft manufacturer has filed yet another unusual patent for passenger seating.

The patent details several designs of stacked seating, reminiscent of bunk-beds, wherein one row of seats is perched on top of the other in order to optimize space in transport cabins of planes, buses and trains.

"In modern means of transport, in particular in aircraft, it is very important from an economic point of view to make optimum use of the available space in a passenger cabin," Airbus wrote in the filed patent.

Consumers my rebuff plans for cramming more seats into an aircraft, especially with airline seats reportedly shrinking more and more each year, but the company hopes to provide a high level of comfort for passengers by designing some seats that can recline 130 to 180 degrees.