I am not sure if you are asking for "Miles for Magazines" or "Magazines for Miles". People above suggested how to redeem miles for magazines, as all airline programs have that option. I am not sure if there is a reverse of that, as purchasing magazine subsription and gettng miles for it. The best that you can do in that case is to charge it to your credit card and get the miles/points for that subscription. I hope that helps

Best,

PedroNY