Which of the following is an acceptable form of government-issued ID for check-in?

An unexpired passport and driver's license are both universally recognized forms of government-issued identification that airlines accept for check-in. A passport is an international travel document issued by the government that verifies a person's identity and nationality, making it a strong form of identification. Similarly, a driver's license is a state-issued ID that serves as a valid proof of identity, particularly for domestic travel. When traveling, passengers must provide a reliable means of identification that meets airline and government regulations, and both an unexpired passport and a driver’s license fulfill this requirement, ensuring secure verification of the traveler’s identity.

Other forms of ID, such as a Social Security card, employee ID badge, or student ID, do not meet the standards set for government-issued identification. The Social Security card is not designed for identification purposes in travel contexts, nor does it provide sufficient identity verification like a passport or driver's license. Employee and student IDs may be useful for identification in some circumstances, but they do not carry the same level of authority and recognition as federally or state-issued IDs for travel purposes.