What can excessive flight time modifications lead to?

Excessive flight time modifications can lead to increased fatigue due to the prolonged hours that crew members spend in operational conditions. Lengthy flight hours, especially when they exceed safe or recommended limits, can strain both the physical and mental capacity of the crew. This fatigue can impair decision-making, reduce alertness, and increase the risk of errors, which are critical concerns in aviation safety.

In contrast, improving performance or enhancing alertness typically correlates with optimal flight time management and adequate rest periods, rather than excessive alterations to flight schedules. Similarly, while extended crew hours may seem like a direct consequence of such modifications, the primary issue at hand is the fatigue that arises from these extended operational periods. This highlights the importance of adhering to established regulations and standards concerning flight time to ensure safety and health for all aviation personnel.