In the past, I would non-rev to Mexico pretty frequently and CAL is who I have the most experience with. However, it's been a little over a year since I've non-reved down there but in the past, every CAL station I've been to wants the departure taxes in cash. I always got in the habit of stopping at the ticket counter when I arrived in Mexico and asking what the departure taxes were so I would be prepared on the return leg (and know how much to take out of my beer money ).