The Skywhale, a concept plane by Spanish designer Oscar Vinals, would include three floors with a total seating capacity of 755 passengers.

Much like luxury ocean liners, the top floor would be first class and have all the associated privileges. The middle floor would be business class, and the bottom floor would be coach.

See: Engineering Update Episode #43: A 3-story, 755 passenger concept plane

According to ABC news, the plane would be an Airbus 380-900 and measure 77 meters, or about 263 feet long.