Pocket Planes will go off; you can choose the first landing and the last landing or all landings that occur. You can also choose for the game to automatically upload from your other iDevice(s) with iCloud. Other options in the Settings page is to have all awards that you have earned for Pocket Planes through Category:Game Center taken away so that they can be earned again. Or to reset the game entirely. If you choose this option, a prompt will appear, and when 'RESET' is selected, the game starts over from the beginning.