Most travelers take a passive approach to collecting Air Miles. The points accumulate in their account and, at some point, they might consider cashing them in for a free flight or upgrade—but there’s a better way to do it. With a more aggressive approach to amassing Air Miles, there’s a chance you may never have to pay for a flight ever again.
https://gizmodo.com/how-an-engineer-earned-1-25-million-air-miles-by-buying-1339646546
