Not sure if others have found this, but the Alaskaair.com award engine works very well for finding AeroMexico award space. The engine works well because it finds point-to-point and connections (many!) when looking at even small cities in Mexico/US and it allows you to easily scroll through days of the week to find space. It actually allowed me to build out a couple of awards during a busy travel period by taking an extra connection and routing through LAP instead of SJD.