I wouldn't count on it being enough time. Lots of times our flight arrives on time, only to be sitting on the tarmac waiting for our gate to open. And the other big problem is that American is based at DFW and can fly out of terminal A,C &D or B if you have an American Eagle flight. But the good news is there are many flights from DFW to LAX and surrounding airports so if you miss your flight there are lots more!