i just noticed this on AA's website:

https://www.aa.com/i18n/travel-info/travel-alerts.jsp

Hurricane Irma - St. Maarten
Information current as of September 12, 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
Change your trip

If your trip is eligible, you can change it online. Here’s how:

Find your trip
If your trip is eligible, you’ll see the option to ‘change trip’ in the toolbar