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Flying High

Now more than ever, top customers of airlines find that loyalty pays. Business 2.0 takes a look at the best – and worst – of frequent-flier programs. By Lia Steakley

Delta SkyMiles

Not happy with your current airline? To steal customers, Delta plays hardball by trumpeting periodic "status matching" offers that let newcomers from rival carriers bring their status with them.

Key markets: Atlanta, Boston, Cincinnati, New York, Salt Lake City

Elite miles: Silver (25,000), Gold (50,000), Platinum (75,000)

Pros: Delta promises to upgrade elites whenever seats are open, and makes it easier to redeem award tickets. Members with American Express Platinum cards get free access to airport clubs run by Delta and partner airlines.

Cons: Miles expire after two years, and free upgrades aren't valid on Delta's partner airlines. Platinum members lose their free access to airport clubs in 2007.

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