It’s a guess, but I would say that they’re aircraft operated by a FedEx subcontractor, which have been repositioned to SXM due to T/S Dorian. They look to be Shorts 360s in Air Cargo Carriers livery. Air Cargo Carriers has been a FedEx subcontractor in the past, and probably still is. There’s another flight inbound from the DR right now, due to land at 5:35.