"Delta Air Lines, United Airlines and US Airways in recent weeks shortened the amount of time frequent flyer accounts can remain inactive, so frequent flyers who are not truly frequent could see their accounts expire. However, account holders need not fly to keep accounts active and accrue miles, as the three carriers said credit card point accrual—which represents more than 60 percent of total miles accrued, according to marketing consultancy IdeaWorks—will keep accounts active.

Delta shortened the inactivity threshold of SkyMiles accounts to two years from three years, citing hopes to reduce administrative costs. As such, "Mileage balances of members who have had no SkyMiles activity within the last two calendar years (2005 and 2006) will expire on Dec. 31, 2006," Delta said in a statement." [Via btnonline.com ]

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