What defines a flight duty period?

A flight duty period is defined as the duration from the time a flight crew member is scheduled to report for duty until the aircraft is parked and the crew is free from their responsibilities, which is often assessed as a specific time period post-landing. The correct definition includes the operational time including any additional minutes after landing which account for post-flight duties.

In this context, the correct choice reflects the standard practice of considering the time from when the crew member is required to report for their shift until the aircraft is secured and the operational duties related to that flight are complete. This period may often be measured with added minutes to account for any necessary post-flight activities such as debriefing or paperwork.

The other options do not adequately capture the full scope of what a flight duty period encompasses, as they either misalign with the established definitions used in aviation regulations or miss key elements such as the conclusion of operational responsibilities following landing. Thus, the most accurate and complete definition aligns with the selected answer.