Harder to Book Frequent Flyer Tickets on Delta
Tuesday, 05 March 2013 | by Pat's Picks

Many travelers say it’s tougher to book a frequent flyer seat on Delta than on other airlines and so USA Today undertook some investigating. The paper took 50 routes at random and tried to get a free seat at the base level. Out of the 50, 42 routes had no seat available. Delta wouldn’t give a straight answer when asked if every flight has at least one free seat available.
SOURCE: USA Today