The mobile app MoonCBook
A reservations, scheduling, operations (including automatic crew rostering), finance/revenue and customer handling system in 1 app.
Fully functioning trial and training versions can be downloaded for free for both Android and Apple devices. You can either play with the test data in the MoonCAir sample or create your own company to access all functions.
Very reasonable priced for airline localized version, like 20k initial and running of 5c per seat sold.
https://www.moonc.mobi/mooncbook/ind..._mooncbook.htm