Musings of the Global Traveller wrote an exhaustive list in a February blog post about all major frequent flyer program expiration policies. I know most of them, but I have found myself frequently referring back to his list.
It’s been extremenly useful to me when I need to remind myself how long I have before my Mexicana Frecuenta miles expire (18 months from last activity, I’ll drop in a mile from Starwood or 1000 from American Express) and how long I can extend my expiring Singapore miles by paying a fee (6 months as I am not a Krisflyer elite).
And he’s even been keeping the chart updated — I notice that after I posted the change in Korean Air policy mere days ago, his February post has been adjusted.
This may be the go-to resource on mileage expiration, and it’s buried in the archives of a blog. Worth a bookmark!