How to unlock Blue airlines in arrivals?

When you have collected enough destination keys you can unlock new air lines as arrivals, but only the green ones. How do you unlock the blue ones?

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The green is unlocked. Tap on a blue one to unlock it.

Quite the opposite actually
@FulltOs the blue is already unlocked, the green is for you to unlock so the blue is something you shouldn’t worry about, as I said, already unlocked

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Of course. Now I feel a bit stupid. Thank you for your kind replies.