I don't know if it's something to do with my Airport Being International

Because before my planes in PRG need silver planes to buy, but once it reach international you can buy them with just Wollars.

And no, I’m talking Map contract planes.

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Yes, once you reach the a star level, the corresponding contracts only cost Wollars. Before that they cost SP in addition to Wollars to get because you don’t have that level of airport yet. Depends on distance but also airline