You want to know the aircraft registration prefixes better? with aircraft registration quiz you can learn them effortlessly and with fun. available on iphone and ipad choose from 3 difficulties, from easy with the prefixes to hard with the full registration. track your scores on the leader boards or in your stats page. earn 13 different achievements through game center. *** experience the game with 10 countries and purchase the full version via in app purchase in just a few clicks. *** the full version upgrade applies to both device (iphone and ipad) just use the restore purchase button in the main menu to update the second device. use the search function if you just want to find a country or registration.