Go to http://www.aa.com and on the dropdown list of "Fare Sales & Special Offers", click on Fare Sales. Or you can try this link (although it might only be for MY current internet session)
Surf, sun, sand and save! Find low airfare to your favorite destination in Mexico, the Caribbean or Central America now at AA.com. Relax seaside with your favorite book or jump in the ocean and explore an underwater world. American Airlines has flight deals that are sure to suit your vacation dreams. Purchase your flight on AA.com by March 20, 2009, and complete your travel by May 20, 2009, to find these low fares.
Here's one that will probably go fast: JFK (New York) to SXM (St. Martin) starting at $96.
There are certain restrictions, of course... Perhaps flying mid-week, but that's not a problem as you can start your charter any day that the yacht is available... It doesn't have to be Saturday to Saturday, for example.
So, check it out and treat yourself to a sailing vacation. Don't you deserve it?