Minor passport, consent and parental authorization rules for travel abroad and the countries that require consent letters, unaccompanied minor fees, age rules and service changes by airline, lap infant, bassinet and child fare rules, family seating rules and enforcement, travel with one parent and custody document rules at borders, child and infant ID requirements for domestic flights, REAL ID rules for minors, cruise line minor and guardian rules, vaccination and health document rules for children by country and passport processing times and expedite windows for children, with the country, airline or rule first and the document to bring.