hi, thinking of booking flight, United, departing Ottawa , Canada, stops in Chicago ( terminal 1), change terminal 2 for Puerto Vallarta. Will have checked luggage which I assume will go directly to Mexico and I know I go thought customs in Ottawa. I have 1 hour and 23 mins, if everything on time...my question: do I need to go through security again when changing gates from terminal 1 to term 2 ?? ?