Finally got some time to extend the calculator to work for the other OW airlines. It was easier than I expected, but still some work. I've included the most major ones, can add the rest later. I've tested the calculations with my own flights and found the calculator results to be +/- 5 points compared to what I actually received from the airlines. Next step is to add some affiliate links (e.g. Priority Pass), so I can look into upgrading the server for the website

As usual, let me know if you see any issues. A helpful info for debugging would be Airline, Origin, Destination and the Booking class.

https://finnair-pc.vercel.app