American Airlines is clearly stating 3.4oz/100ml on their web site.

"Liquids must be carried in individual containers not exceeding 3.4 ounces/100 ml.

All liquid containers must be carried in a separate clear plastic, zip-top bag (see example at right) that does not exceed 8 inches x 8 inches (20 cm x 20 cm) or is quart size. Items must fit in the bag comfortably and the bag must be completely closed. "

http://www.aa.com/apps/netSAAver/Vie...omotionContent