Subscription Pro and plane away

Hello everybody,
Last month I bought the 777-300ER for infinite flight. After that, i bought a subscription for a month for IF pro. 2 days ago, the subscription ended (unfortunatly), and ehat happend; my tripple 7 is away. When I want to have it again, I have to buy it for 5€. Why is this?! This is not very fair, because I already bought it. Help!

If you have iOS, “Restore purchases” usually helps out with these issues.

If Android, a restart or in worst case, reinstallation of the app should fix it.