We have received reports of crashes in Infinite Flight after some Samsung users installed the Android 5.0 Lollipop update.
The issues causing the problems are from the Samsung firmware update. Until Samsung updates again with a fix for these issues, you can try deleting Infinite Flight, restarting the device and then reinstall through your Play store.
If that does not resolve the problem, a factory reset to your device may be necessary, and is advisable.
In either case you do not need to worry about being charged again for anything you have already paid for. Google Play will not charge you again unless you use a different Play store account ID, or had been refunded..
Again this is specific ONLY to Samsung devices.