I think my original advice was sound, for ANY DL flight at ATL- if you can get to INTL easily, do so (hotel shuttle, rental car shuttle, or as one poster suggested, taxi). Yes it's a long drive but usually seems worth it, especially after 2PM when pre-check opens.
The added benefit is that you are at the F SC.
Do not bother leaving main terminal to go to the INTL terminal, it won't be worth it.