American, US Airways merging mile programs in '15

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.

http://www.timesheraldonline.com/business/ci_26813956/american-us-airways-merging-mile-programs-15