American has posted a fee change waiver policy for travel to SXM on its Travel Alerts page
https://www.aa.com/i18n/travel-info/travel-alerts.jsp
Hurricane Irma - St. Maarten
Information current as of September 14, 2017

If you’re traveling to/through/from:

St. Maarten, St. Maarten (SXM)
The change fee may be waived if you:

Are traveling on an American Airlines flight
Bought your ticket by September 10, 2017
Are scheduled to travel September 5 - December 31, 2017
Can travel September 10, 2017 - September 30, 2018
Don't change your origin or destination city
Rebook in the same cabin or pay the difference

Good luck to all.