I have not booked my trip yet, but I would like to go to Puerto Vallarta at the end of August. My issue is I just ordered my new 'adult' passport on May 21st, my old passport was when I was 15 and they require you to get an adult passport which is starting over....I think. Am I going to run into issues crossing the Mexican border going in and leaving? I will try and stick with delt airlines, but the other airlines that are available are Aeromexico, United, and Alaska Airlines. I've read that I can call the airline and ask them if I'd be okay, but how reliable is their word over the phone as opposed to the entry gate and immigration?