What are the tail end assignment rules related to?

The tail end assignment rules specifically focus on the conditions under which flight crews are assigned trips after their initial duty has concluded. These rules are designed to ensure that crew members do not exceed legal limits for duty time and rest periods, particularly when they are assigned additional flights towards the end of their duty period.

Understanding these conditions is crucial because they help maintain safety and compliance by regulating how and when flight crews can be called to work again after having served a set schedule. This safeguards against fatigue and ensures that all operational standards are met, aligning with regulatory requirements.

While other options may relate to aspects of duty time or scheduling, they do not specifically cover the nuances of assigning trips that occur at the tail end of a crew's duty.