The SJU based flying could be anything... In the winter its often relief for the outstation pilots - ie the Tortola pilot flys his first leg in, you pick it up and do a round trip while he rests, then you hop into the St Croix plane and do a turn while that pilot gets her break....

All the flying will be out and backs, usually with minimal ground time at the outstation. Sometimes, not very often, a middle turn will cancel and you sit in the outstation for a couple hours.