Also @DegxI you could check this other charts for the best world enhancement mods (not all free, but the free ones are marked with ‘F’ in that $ column).
And there is one for Airfields I made, which are also not all free but has many top quality ones from .to. If you want to see that, it is here:
(there is a link to a sheet with links to the downloads at the bottom of the first post).
And also a list of cool (mainly free) Bush Strips, so depends what kind of flying you are gonna be doing as to how useful this would be:
