If it's the same plane, I believe it possibly landed over the weekend? I happened to be looking at the Maho Beach cam and noticed a large inbound plane on the flight radar map fairly early in the morning. When I clicked on it, it came up as an Azerbaijan 340 from GYD with no destination information. It seemed strange, but given that it was inline with the SXM runway I watched it for about 10 minutes until it landed. I also noticed that a scheduled flight arriving around the same time from the US did a quick loop west of the airport in order to allow the 340 clearance.