I don't think it needs to compete with St. Thomas flights dollar for dollar - It could be a little more expensive. It could then still be an attractive choice to the potential St. Thomas visitor and a cheaper alternative to those going to BVI via St. Thomas and ferry.

I think it really will be a limited market though. For many, existing options are better. For us, going non-stop to PR and then a commuter plane to BVI would still take less time, likely get us in sooner and probably be similar in cost.