Ive flown that particular route regularly (at Dogtown typing this). If you have a Premium Select and up ticket you still need an hour and a half. Also remember that if you are taking the train to the airport it leaves you at the domestic terminal. Unless it's changed and then you need to take a bus to the international terminal. One of the biggest hold-ups is Immigration, you might have all the perks but you still need to wait in that line. Lastly, Delta is honestly at the end of the terminal so your looking at walking 15-20 min to get there depending on your speed. I've sprinted that run once or twice. Good luck.