the development of a crypto currency that is positive if the airport can already be used to make payments is certainly easier and more practical, of course, a country that legalizes crypto currencies that can do that
In my opinion, the purchase of flight tickets does not depend on the airport, but ticketing companies that work with airlines in determining the currency that can be used to buy tickets. One of them uses bitcoin. But the use of bitcoin must be in a country that has legalized bitcoin, in a country that prohibits bitcoin it cannot be used to pay anything.