Read the whole route, not just the ticket
An itinerary may cross several borders even when the traveller is focused on one destination. List each country and transit point, then look up the current document rules for those stops.
Check passport validity against destination requirements. Visas and other authorizations depend on the traveller and purpose of the visit, so rely on official information for the particular journey.
A record you can revisit
Keep booking references and useful contacts together. Review travel advice near departure and revisit any affected requirements when the route changes.
This article offers general information. Requirements depend on the traveller and itinerary; confirm current rules with the appropriate authorities.

