Firstly
Because air transport is used by the elite of a country and supports commerce and tourism; whilst putting a paved road, clean water and electrify to a remote village doesn’t
Secondly
They don’t
There are plenty of places that are not allowed to fly in EU or US airspace mostly for safety reasons
[https://en.wikipedia.org/wiki/List_of_airlines_banned_in_the_European_Union](https://en.wikipedia.org/wiki/List_of_airlines_banned_in_the_European_Union)
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