I am not a Delta pilot, however I do fly for a non Delta owned regional partner. We have family in Gainesville so I have made the trip several times. I fly at very low priority and I have never not made it onto the flight either direction. There was once where my son and I ended up with the last seats on the airplane, but every other time I easily made it and even got first class (who cares on the 717 though) a few times. My in-laws using the buddy pass which is about as low priority as it gets have also never not gotten on that leg before. So I would say for the most part, you should be good to go.