What must be checked regarding the validity of international tickets?

The validity of international tickets is critical to ensuring that travelers can complete their journeys without issues. When assessing the validity of international tickets, checking if any portion of the ticket was used as of the issue date is particularly important. This check determines if the ticket is still valid for the remaining segments of the journey. Many airlines have policies that may invalidate a ticket if the traveler has not used the ticket according to the specified conditions or if there are segments that have been flagged as unused.

Understanding this aspect can prevent complications for travelers who might encounter problems when attempting to board their flights for the remaining legs of their journey. If a part of the itinerary has been used without proper adjustments made to the ticket, the airline may not honor the remaining travel plans. Therefore, this verification plays a key role in confirming that the ticket maintains its validity and aligns with travel regulations and practices.