Results from Storm Carib this morning.

"Results for St.Maarten/St.Martin (18.05N, 63.12W):
The approximate Closest Point of Approach (CPA) is located near 18.3N, 62.7W or about 32.5 miles (52.3 km) from your location. The estimated time of when the center of the storm will be at that location is in about 24 hours and 3 minutes from now (Sunday, October 22 at 8:54AM AST)."

Based on the above, I don't think the airport will be opening at 9 AM on Sunday.