Contrary to other airlines, AA.COM doesn't show a timer when you book. The timer is supposed to indicate that the rate has been locked and will expire in so many minutes in you don't complete the booking.

I'm curious if AA.COM has a similar timer, hidden in this case, or there is no protection of any kind at all until you end the booking process. I am guessing there is some protection lock, perhaps not from the very first step when you search for flights, but at least when you are more advanced in the booking process.