Hi, I'm flying on a painful Spirit redeye out of the T1 B Gates. I'm hoping to get to the airport early and hang out in the Centurion Lounge, which is in the D Gates. Is there an easy way to get between B and D? Can I go through security at Terminal 3, since it seems easy to get to D from T3, and then go to B when it comes time for my flight? Tips appreciated!