Your point actually illustrates the argument against free markets quite well. When you don't consider the whole of what gravity actually does it sounds like it would be a lot simpler to build an airplane. The unfortunate reality of the situation is that the fantasy land doesn't actually work because of the many unintended consequences of eliminating gravity. Like the many unintended consequences that happen when you let people lend risk free.
For your example just considering the airplane, the air would have no reason to stay near the earth, nor would there be any reason for the matter in the earth to coalesce.
The sun would also almost immediately explode because of the immense pressures required to produce nuclear fusion.
Please study a little public choice theory. You're arguing from a perspective of incomplete information, as I see it.
You can't have free markets in the way you advocate in the presence of democracy as we know it. To argue for what you want, you need to describe how we would change our governmental structure to make it work. Perhaps an authoritarian rule by a benevolent AI?
For your example just considering the airplane, the air would have no reason to stay near the earth, nor would there be any reason for the matter in the earth to coalesce.
The sun would also almost immediately explode because of the immense pressures required to produce nuclear fusion.