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CNN | SkyMiles no longer expire, Delta Air Lines announced Tuesday.
The frequent flier perk system, which enables users to earn free plane tickets or in-flight upgrades, is the first among major U.S. airlines to preserve points indefinitely.
Before January 1, 2011, SkyMiles became invalid if no qualifying mileage activity, such as acquiring or redeeming miles, occurred for more than 24 months.