Which item is considered essential crew documentation for international operations?

The essential crew documentation for international operations is the FAA card. This card serves as proof of certification for the crew members to legally operate an aircraft, particularly in international airspace. It verifies that the crew members have met the regulatory requirements set forth by the Federal Aviation Administration, which is crucial when flying across international borders.

Having the FAA card is a critical aspect of compliance with international aviation regulations. It ensures that the crew is authorized to perform their duties on international flights, which often involve various jurisdictions. While items like the flight manual and in-flight service catalog are important for operations and service delivery, they do not serve as regulatory proof of certification. Similarly, passenger feedback forms, while useful for improving service quality, do not relate to crew certification or legal operation requirements.