If you're racking up those frequent-flier miles, wouldn't it be nice to know that you're doing it with an airline that's giving you a good shake?
The people who publish the Consumer Reports Travel Letter think so. A reliable friend to bargain-minded travelers everywhere, the Consumer Reports Travel Letter (subscriptions:  999-7959) frequently ferrets out the best and worst in travel, and it recently turned its attention to the airlines' frequent-flier programs.
Which one is best for you? Well, it depends.
If you fly mostly short trips, it's best to hook up with a frequent-flier program that offers a high minimum mileage. Northwest, TWA, USAir, America West and Delta are good bets here, they say. (Delta offers a whopping 1,000-mile per-flight minimum, but it also requires you to collect a mess of miles.)