Think of it as an airborne equivalent of UK drama series Upstairs, Downstairs: the huge Airbus A380 soaring through the skies, with well-heeled passengers enjoying spacious suites and seats on the upper deck while hundreds of economy class travellers are jammed together on the lower deck.
At least that's how airlines would fit out their superjumbo fleet if Airbus had its way.
As it happened, many airlines to adopt the superjumbo – including early customers Singapore Airlines and Qantas – opted to place their exclusive first class cabin onto the lower deck, with business class stretching along the upper deck.
Many other airlines followed their lead: only a handful – Emirates, Etihad Airways, Lufthansa, Qatar Airways and Thai – bucked the trend and nestled their first class suites into the upstairs nose of the A380.
Upper decks for the upper classes?
Airbus believes that many airlines' decision to park first class on the A380's lower deck was made partly out of their experience with the Boeing 747, where the pointy end of the jumbo's hump suffered from higher noise levels than the main deck.
Additionally, Airbus says that the early days of the A380 saw relatively few boarding gates where passengers could directly board the superjumbo's upper deck.
If airlines wanted an exclusive boarding channel where their most valued passengers could walk straight from the departure gate into their plush suite, that meant first class had to sit downstairs.
However, Airbus argues that a decade of airlines flying the A380 has seen airports upgrade their facilities.
The superjumbo's narrower upper deck is also better suited to a more efficient use of space for first class suites in a four-across (1-2-1) layout, while the wider lower deck provides more room for more economy and premium economy seating.
How much more? Airbus estimates that 74 economy seats could fit into the front section of the lower deck in a 10-across (3-4-3) arrangement.
But it allows that airlines could "further optimise" their layout by moving to an 11-across grid of 3-5-3 seating, in what it terms 'budget economy' mode.