Commuting between terminals at major Mexican airports can be challenging. Most international airports, like Mexico City and Cancun, feature multiple terminals often disconnected by walkways, necessitating the use of trains or shuttles. Active passengers can board airport trains with proof of travel, while bus services are available for anyone. At Mexico City International Airport, for instance, the Aerotren connects terminals, operating daily from 5 am to 11 pm, while Cancun\'s free shuttle runs every 10 minutes.