Which of the following options is correct regarding personal travel through KCM checkpoints?

The correct option indicates that only domestic travel is allowed when passing through KCM (Known Crewmember) checkpoints. This policy is in place to ensure that airline crew members, while traveling for personal reasons, adhere to specific travel regulations designed to maintain security standards.

KCM checkpoints are primarily established to facilitate the movement of airline crew members within the United States. Therefore, when traveling internationally, crew members typically would not use KCM checkpoints since international travel involves different security and customs protocols, requiring additional documentation and procedures.

In terms of the alternatives, it is clear that the allowance for international travel does not apply at KCM checkpoints, as the measures specifically govern domestic facilitation. The prohibition of travel for non-emergencies is also inaccurate because personal travel, as long as it's domestic, is permitted under KCM guidelines, making the claim about prohibiting non-emergency travel an incorrect context of KCM usage. Thus, the focus on domestic travel in the correct option aligns perfectly with the operational purpose and regulations bound to KCM checkpoints.