The EVA Air Boston Office in USA can be consulted as to travelers who need general reference to documentation and procedures. Entry requirements can be different depending on whether the traveler requires a valid passport, transit or entry visa, transit or entry authorization, health documentation, or additional documentation to reach the final destination. Distance traveled, nationality, country of transit, and purpose of journey can all contribute to variation in documentation requirements. Since rules can often change, travelers may need to contact the official authorities before they make their journey. Getting general information from customer service may be necessary, but know these requirements in advance to avoid problems at check-in and boarding and to ensure a smooth and enjoyable trip for everyone involved. Students, tourists, businesspeople, visiting family members, and other travelers can all have different requirements for documentation.