What kind of certificate is issued to crewmembers of U.S. air carriers engaged in international air commerce?

The correct answer is a crewmember certificate issued by the FAA. This certificate is specifically designed for individuals who serve in various roles on an aircraft, ensuring they meet the regulatory requirements set forth by the Federal Aviation Administration. It encompasses all necessary training, safety standards, and operational knowledge essential for crewmembers engaged in international air commerce.

This designation is vital as it confirms that the holder has undergone the requisite training and possesses the knowledge to perform their duties safely and effectively in a complex international flight environment. It's important to have this certification for cross-border operations, as it aligns with international aviation standards and regulations.

The other options do not accurately reflect the specific certification for crewmembers on international flights. The commercial pilot certificate pertains to pilots rather than overall crewmember roles. The flight engineer certificate, while relevant to specific operational roles, does not encompass all crewmember functions. As for the crewsafety certificate, it is not a recognized term in aviation certification and does not exist within the framework of FAA certifications.