Bolivia is, well, unimportant, and their complaints to the US will amount to nothing. There are exactly 2 countries in the world that the US cannot mess with. If it was a Russian or a Chinese plane, do you all think it would be denied airspace entry? (And EVEN IF it was denied entry and still decided to go through, do you think anything would happen to it?)
What should be downvoted is the state of affairs when a US whistleblower has to be escorted around the world by Putin himself to guarantee his safety.