[Kociub]

A radical solution, I know, but why not just pay for flying over someones land? And, if your destination is not available through another route at the right price/format, just take the bus?

[archgrove]

People do. They're called "overflight fees". Often they're waived by mutually beneficial consent. For example, the USA often charges them when a flight doesn't originate or end in the US, but passes over US airspace.

Next bizarre justification for benefiting from other peoples' commercial work without paying?

[icebraining]

Your mistake is assuming there needs to be a justification.