can planes fly on that?
https://www.govisitcostarica.com/category/transportation/airlines.asp
While you won’t find large jumbo jet airplane in these domestic airlines, you’ll discover that there are other ways to fly! These airlines operate a variety of small single & double prop planes that are never too crowded since they can only carry between 9 and 25 passengers at a time.
I'm pretty sure single and double-prop planes could use some form of diesel fuel, or something easily converted from it.