Fly Free: Frequent-Flier Miles Secrets

Lately, rental-car companies are providing more-tempting deals. Midwest Miles and Northwest WorldPerks members double their miles with Hertz; Continental OnePass users triple their mileage with Alamo. Dining, too, is paying out more than ever: United gives you up to 10 miles for every dollar you spend at participating restaurants (find a list on mpdining.rewardsnetwork.com); Delta’s SkyMiles Dining program offers up to five per dollar (and was recently awarding 1,000 bonus miles for the first $50 spent).