During which hours is same runway separation for A behind A aircraft observed?

Same runway separation for aircraft of the same category, such as A behind A (where A represents a specific category of aircraft), is typically observed from sunrise to sunset. This practice ensures that controllers manage the increased visibility and the more predictable behavior of aircraft during daylight hours.

During this time, pilots and air traffic controllers have enhanced visual reference, which helps reduce the risk of collisions and improves overall safety. Operating under daylight conditions allows for better situational awareness for all parties involved. Nighttime operations could involve reduced visibility and increased complexity due to other factors such as fatigue, which may suggest a different approach to separation.

While the other options refer to broader periods, they do not specify the critical factor of visibility and operational safety that dictates this separation practice during daylight hours. Therefore, the correct answer reflects the enhanced safety protocols observed during sunlight hours rather than throughout the entire day or exclusively during nighttime.