For Delta's frequent flyers it's nothing but blue sky. Starting this week Delta Air Lines SkyMiles will no longer expire. The decision comes on the heels of similar adjustments made in programs run by United Airlines and American Airlines. SkyMiles will not expire as long as a member participates in one of the following activities every three years takes a qualifying flight on any Delta service; earns SkyMiles through one of its program partners; or redeems SkyMiles for any SkyMiles award. Since 1995 Delta required its members to fly at least once every three years to avoid mileage expiration. Under the new policy, cardholders who use their American Express/SkyMiles Credit Card at least once every three years, do not have to fly or redeem awards to maintain mileage. SkyMiles has 13 airline partners, 23 hotel partners, five car rental partners. The 'Delta SkyMiles' program has 26 million members with more than one million members carrying the AmEx co-branded credit card. For more information www.deltaairlines.co m/skymile/index.html