This was a fun side project to parse data from the British Airways airmiles redemption API and present a map of where the user could travel on a given date, in a given airline cabin.
This app was successful in providing functionality that didn't exist anywhere else at the time. I gained access to their API by reverse-engineering their Android app, which hit unsecured endpoints. However, British Airways tightened their API authentication and I lost access to the data.
For similar functionality (although you'll have to pay for it), I recommend SeatSpy