Airbus A880 Ultra Jumbo Jet Aircraft
I imagine when Airbus A880 become reality. Yes so called quadruple-decker ultra jumbo jet aircraft.
Current Airbus A380 is only has two decks, if whole seating plan turn into economy class there will be 800 passengers on board of aircraft. This probably will decrease baggage and another payload.
Using simple math, double-decker gives you 800 passengers while four decks would double it, probably more than 1,500 passengers able to carry at once in Airbus A880!
Again, if this happen, i suppose Airbus should modify and tweaked its power plant to even much stronger than A380. Because large aircraft is not all about economic or business matters. For me and another passengers boarding-on huge aircraft is fun and for some people addicted.
We hope Airbus or any aircraft maker would see our vision and make some spectacular and sensational aircraft master piece.