There are two USA issuers of AA co-branded cards, each with its own products, policies and practices. Read the Wikipost at the top of each thread to get an overview of the current offers and issues. Then then read a few weeks' posts to have a sense of how things are changing:

Barclays card is discussed here: http://www.flyertalk.com/forum/credi...iator-40k.html

Citi cards are discussed here: http://www.flyertalk.com/forum/citi-...24-months.html