American Airlines and US Airways will combine their frequent flier programs early next year and, for now, will continue to base free flights on how many miles customers fly. Delta and United, on the other hand, plan to base awards on how much customers spend. That helps travelers who buy expensive first-class and business-class tickets. Executives at American Airlines Group Inc. said Tuesday that they want to deal with the mechanics of combining two big programs before addressing such a major change. The combined program will have about 100 million members. TheStreet's Scott Gamm reports from New York.