American AAdvantage has extended its Chicago promotion until Feb. 28 (it was originally set to end Dec. 31). Fly roundtrip from or to Chicago once, get 5,000 bonus miles. Fly twice, get 10,000 bonus miles or fly three times and you will earn 25,000 bonus miles — enough for a free ticket. Members must register for the promotion before flying at aa.com, using promotion code FLY06. And if you pay and book your travel at aa.com, you can earn up to 500 bonus miles (250 for coach tickets). Enjoy the windy city!