What is required for international travelers when checking in?

For international travelers checking in for their flights, having a valid passport is crucial as it serves as the primary identification document required for international travel. Passports verify a traveler's identity and nationality, and they are essential for border control and immigration procedures. Airlines require passengers to present a valid passport to ensure compliance with international travel regulations and to facilitate the departure and entry into foreign countries.

While a driver's license is a valid form of identification for domestic travel, it does not suffice for international flights, where passports are mandatory. An airline confirmation may be needed for check-in, but it does not replace the requirement of presenting a valid passport. Hence, claiming that no identification is necessary fails to acknowledge the critical role that a passport plays in international travel.