The only thing I could find on this was this Reuters article. The Colonial Pipeline which carries all sorts of fuels passes through Atlanta and since Maryland gets 40% of its fuels from this pipeline, im guessing that Atlanta/Georgia gets a good amount from this pipeline too. Im sure they will find ways to get fuel to these places, but its going to be more expensive. The only impact I could see on Delta is higher fuel costs and having to maybe charge a fuel surcharge on all ATL flights? Maybe higher ticket prices? Im sure someone has a better speculation.