On AA all awards are one way; some have them on the same PNR, others don't. Different airlines makeno difference. The second award should provide sufficient proof you're going to depart within the six months allotted. But:
I've been asked (by immigration) how long I'm planning to stay, but in well over half a century of travelling to Mexico I've never been asked to show proof of onward travel. And I've flown commercial one way and private, rail, bus or drivjng the other.
Last edited by JDiver; Nov 7, 2014 at 9:06 pm