When do most midair collisions occur, according to statistics?

The correct answer highlights that most midair collisions occur in good weather and during daylight hours. This conclusion is supported by statistical data that indicate pilots may have enhanced visibility and increased chances of spotting other aircraft in clear conditions. Daylight allows for better visual scanning and aids situational awareness, which is crucial when it comes to collision avoidance.

In good weather, pilots are likely to be flying more often as weather conditions do not pose any additional challenges, and flights tend to happen more frequently during daylight hours when visibility is highest. This combination results in a larger number of total aircraft in the air, leading to an increased likelihood of midair collisions simply due to volume, rather than the actual conditions in which the flight is taking place.

Other options, such as poor weather and nighttime, typically contribute to a higher risk of accidents in general, but they lead to a reduction in flight operations. Similarly, military exercises may have their own unique operational protocols which can differ significantly from civil aviation, and congested airspace arrangements typically include more stringent air traffic control measures that aim to prevent midair collisions. Therefore, the statistical evidence points clearly towards good weather and daylight conditions being the time when most midair collisions happen.