Just noticed this on http://www.aa.com/i18n/utility/galaxyTab.jsp (bolded for emphasis)

The innovative, Samsung Galaxy Tab™ 10.1 Android platform tablet, featuring a 10.1 inch screen, enables a customized viewing experience. Our First and Business Class passengers will enjoy the tablet along with Bose headsets on the following flights.

Flights Served With 737-800 Aircraft Between:
Boston and Los Angeles
JFK and Seattle
JFK and San Diego

Flights Served With 767-200 and 767-300 Aircraft Between:
New York's JFK and Los Angeles
JFK and San Francisco
Miami and Los Angeles
Miami and San Francisco
Dallas/Fort Worth and Honolulu
Dallas/Fort Worth and Kahului

Flights Served With 757 Aircraft Between:
Boston and Los Angeles

International Flights Served With 767-300 Aircraft to and From:
Europe and South America