The App A320 WB Weight and Balance was created for the purpose of training, and works with AHM-560 calculations formula and is be used as an Weight and Balance Educational Tool. The app includes: three versions for the A319 and four for the A320, and three for the A321. If any of those preset versions does not match your aircraft, you can always use the configuration menu and adjust the pax and cargo indexes to match the ones you need. The fuel indexes are not changeable but are the most standard ones.