[header] How to save frequent flyer miles about to expire [title] Shop through an airline portal. [step] Almost every airline has online malls or portals where you can shop. You'll earn extra miles on your purchases, and the clock will " reset, " so you won't lose any miles because of inactivity. 
To shop, visit your airline's portal and search for a store. Then click through to the retailer's website when you are ready to make your purchase.