I'll be travelling from BOS to SXM on DL in a few days, connecting at JFK. I've got a 70-minute connect time in JFK. It looks like my flight from BOS will probably come into T2, while the JFK-SXM flight will probably leave out of T4. I see that there is an airside bus (JFK Jitney) which shuttles people between T2 and T4. I usually fly AA, and this is my first time using DL through JFK. I'm wondering if 70 minutes enough time to deplane and get from T2 to T4 using the Jitney? Anyone have experience with this?