I've taken advantage of this new "feature" a few times now, and have found it to be very nice. I just call up DL a few hours before the flight I want, and they've always been able to accomodate me (of course, my fare class doesn't change
) I do have to say that I really like this feature alot, especially since I usually fly on very low-fare, restricted tickets. I'd be interested to hear other peoples comments on this.