Delete and re-install Infinite Flight. If that doesn’t do it, restart your device.
If that doesn’t do it, try contacting @Tyler_Shelton or @schyllberg !
I was just about that ask the same as @PiloteerFrankie
It would be good to know what you’ve done so far, so we’re not advising you to do the same thing all over again.
It would also be good to know what kind of iDevice you are using :)
Restart the app, if that doesn’t work restart and refresh your device. Make sure that all of your background apps are closed. Once you begin a session with Infinite Flight do not back out of the app. Your last resort is to back up your device then delete the app and reinstall.