Which of the following is NOT a required document to carry on a plane?

The choice concerning the Flight Training Certificate is accurate because a private pilot is not required to carry a Flight Training Certificate while flying. This document is mainly relevant during training and doesn't apply once a pilot has obtained their private pilot license; therefore, it is not a necessity during flight operations.

In contrast, the Pilot Operating Handbook is essential as it outlines the aircraft's operating procedures, specifications, and limitations. The Certificate of Registration is crucial because it verifies the ownership and legal status of the aircraft. The Journey Log is also important, as it documents the details of each flight, including the departure and arrival locations, which is required by regulations.