If flying domestically, ensure that you have a REAL ID-compliant driver’s license or identification card.
After October 1, 2020, the REAL ID is required for all passengers flying domestically unless you present an acceptable alternative.
More info about the REAL ID and other acceptable forms of identification here: (https://www.dhs.gov/real-id-frequently-asked-questions)
Check passport expiry date: You need a minimum of 3 unused pages & a minimum of 6 months validity on your Passport from your trip RETURN date.
Check this link (https://www.us-passport-service-guide.com/passport-pages-for-visas.html) for country-specific page requirements if visiting multiple countries.