From what I understand it's the maintenance and the fuel cost that makes A 380 so expensive for the owner, and it was therefore some airliner had cut down on their order.
My point:
It's not so much the size of a civil plane, but more a question of:
Material
maintenance cost
Fuel cost.
What future plane should have is
Material that is way easier and way strong than todays correspondence
and furthermore is easy and cheap to maintenance
Fuel well the engine they have today are, what I understand, made effective as possible
So perhaps they should look into alternativ fuel who may be cheaper and more green to the environment
But what do I know about all this.
Markus
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