Which of the following does NOT limit a person's readiness for flight duty?

Being fully crew rested is a state that enhances a person's readiness for flight duty rather than limiting it. Adequate rest is crucial for pilots and crew members to ensure that they are alert, focused, and able to make critical decisions during flight operations. Physical and mental fatigue can severely impact performance, whereas proper rest promotes optimal functioning.

In contrast, the other options represent factors that can hinder a person's readiness for flight duty. Illness or fatigue directly affects cognitive and physical abilities, while time spent on personal matters may distract or preoccupy a crew member's mind, detracting from their focus on the flight. Additionally, a lack of flight experience can impact a person's confidence and decision-making abilities in an aviation context, making them less prepared for flight duties.