it seems that the only advise the U.S. Govt. has for U.S. citizens on the French-side is to get to the Dutch-Side airport (PJIA), and not to try to do so in the dark.
My additional comment to this is if someone can safely get to St. Barths by boat from the French-side, the following info from them may be of interest:
"For U.S. Citizens in St. Barthelemy: The St. Barthelemy airport is open and charter services are flying. Tradewind Aviation is flying several flights each day from St. Barth�s to Puerto Rico. Tradewind can be contacted at 800-376-7922 x123. These flights are not affiliated with the U.S. government."