What a generous offer! Specially marked packages of Kellogg's cereals, Nutri-Grain Bars/Pop-Tarts, etc. have a coupon on the back worth 100 American Airlines frequent-flier miles. When you collect 5 coupons, you mail them to Kellogg's and your AAdvantage account is credited the 500 miles. I've gotten probably 5000 miles that way.