With iOS 10.2.1 iCloud syncing has stopped working for Pocket Planes. We do not have a solution at this time.
If you plan to transfer all of your apps to a new device, an iTunes or iCloud backup is the way to go. It will move all of your apps and their data to the new device. Please see the following link for more info on backing up and restoring: http://support.apple.com/kb/ht1766.
Mac users, iCloud syncing for the Pocket Planes Mac version is no longer supported.