Which of the following is NOT a required pilot document?

A flight plan is a document that pilots file with air traffic control to inform them of their intended route, departure, and arrival times, as well as the type of aircraft they will be operating. While it is a crucial part of flight operations for ensuring safety and communication with air traffic, it is not a document that a pilot must carry on their person or have readily available while flying, unlike the other options listed.

In contrast, pilot certifications, a government-issued ID, and a medical certificate are all mandatory documents that must be verified and carried by a pilot at all times when exercising the privileges of their pilot's license. These documents serve as proof of the pilot's qualifications and legal ability to operate an aircraft, which is essential for ensuring safety and compliance with aviation regulations.