I stopped flying DL completely when they dropped the option of segment qualification. Many of my flights are short hops, but it is not unusual for an IAH/JAN on a COEX flight to cost more than a full service IAH/LAX flight with the possibioity of an upgrade. I know others, who have had the option--DL doesn't own the store in their area--have left for the same reason. And I've been much happier on CO all the way around.