Last Updated Aug 16, 2010 1:07 AM EDT
Recently, the Atlantic documented the availability of reward miles by airline. It's a bit eye-opening.
Southwest, for example, ranks best, with 99.3% of its seats available for booking with frequent flyer miles. A handful of other airlines, including Air Berlin, Air Canada, and Virgin Blue, all placed in the 90 percents.
Delta and US Airways pulled up the rear with a paltry 12.9% and 10.7%, respectively.
Granted, airlines don't make money by giving seats away for free, but Delta performed three times worse in this category than the next closest carrier, Turkish Airlines.
I should also point out that US Airways recently finished rather dismally in another comparison chart -- on-time arrival performance.