For my upcoming trip JFK-SIN-DPS, there is a ~90min layover in SIN in both directions. I've never transited in SIN before, from my research the arrival from JFK(FRA) will be a different terminal than the departing flight for DPS. I think I'll be fine if the incoming flights are on time, but I'm wondering how big of a buffer do I have for a delay and still make it out of SIN? Would they have a rep waiting at the gate to escort J passengers to the next flight if there is a delay? Also hoping that I'll have time to check out the lounge! TIA!