Nice app. Thanks.

Where do you get the database of city-pair distances from? I compared some routes in your app with back calculations from Miles I was credited and they do not match.

Flying Blue used of have an online calculator for Award Miles and Level Miles before the big program change in April 2018. Shame they never updated their old Miles calculator and obviously just dropped the spend-based Miles earning from it. They've got their Flight Type simulator (i.e. original XP calculator) based on XP band (Long 1 etc.) for a given city-pair.