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I find the use Aircrafts as the plural of Aircraft kind of sweet https://developer.schiphol.nl/apis/flight-api/aircrafts

Seems like an intentional pluralization miss to keep "consistency". I'd prefer to closely reflect the clients terminology though.

Seeing as they also use APIs and API's, I don't think it's intentional, but badly written.

Or written by people whose native language isn't English, which is a possibility.

In Dutch, 'API's' is correct. This is probably a mistake while translating.