I’ve always been intrigued by “superjumbos, which I unscientifically define as “any airliner which is bigger and/or can carry more passengers than a 747.” Perhaps the only mass-produced superjumbo has been Airbus’ doomed A380, a luxurious plane that was nonetheless brought down by an inability to be used as a freighter and a shift away from the “hub and spoke” model that it was designed for.
But with the hub and spoke model in place, and with air travel increasing, the superjumbo does make at least conceptual sense. The justification works like this: If, thanks to a lack of runway space, you can only get X number of flights per major airport, you might as well give them to a bigger plane. To oversimplify it, the choice isn’t between two planes with 300 passengers each or one with 600, it’s between one with 300 or one with 600.
Granted, there are many, many practical obstacles too, like if your superjumbo needs more engines and/or is less fuel efficient (neither an unreasonable thought). But the place for these aerial titans is a legitimate one. Or at least an excusable one with regards to getting one or more of the many on the drawing board designs into alternate production.
And of course, mammoth aircraft that, unlike the A380, were designed to be heavy freighters, do have a niche role in carrying big and oversized loads. See the late An-225 (which had a passenger variant proposed!) and the Super Guppy/Beluga/Dreamlifter oversized transport planes.
It’s all food for thought. After all, what aviation enthusiast doesn’t like gargantuan planes?