Pack layers for November travel: Mexico City's days are mild but nights are cool, so bring a light jacket, comfortable walking shoes for cobblestone streets, and a compact umbrella just in case. For departures from Chicago O'Hare International Airport (ORD), allow extra time for security and check-in during holiday windows and use TSA PreCheck if eligible. At Benito Juárez International Airport (MEX), use authorized taxi services, verify rideshare pickup points, and keep small local-currency bills for taxis, tips, and markets. Stay mindful of festival crowds during Día de los Muertos in early November and book accommodations near your preferred activities to minimize transit time. CTA: prepare a travel checklist and confirm your ORD–MEX flight status before leaving home.