What specific housing feature is required because Leghorns are notorious flyers?

The run must be covered

Leghorns possess a strong flight capability, stemming from their lightweight build and active nature, which presents a significant containment challenge for owners, especially in backyard settings. Because they can easily scale standard fencing, any outdoor run area intended to confine them must incorporate a cover overhead. This prevents them from flying out to roam long distances, which they are naturally inclined to do. Additionally, their preference for roosting high extends to their environment outside the coop, often leading them to select tree branches as overnight resting spots. This tendency necessitates that owners map out potential high roosting areas relative to valued assets, as they deposit droppings directly below wherever they sleep high up.