What does it mean if a pilot sees "S" next to a runway on a chart?

When a pilot sees "S" next to a runway on a chart, this indicates that the runway is soft. Runways described as "soft" often pertain to those that may have a surface condition that can be affected by weather or other factors, such as recent rainfall or snow, making them less firm or more yielding than standard paved surfaces.

This notation is particularly relevant for pilots when making decisions about which aircraft can safely use the runway, as softer conditions can increase the risk of tire deformation, longer landing distances, and other handling issues during takeoff and landing. Understanding runway surface conditions is crucial for ensuring safety and aid in flight planning.

The other options do not accurately reflect what the "S" designation signifies. The runway being smooth, short, or sloped does not capture the key concern a pilot should have regarding the runway's operational capability and safety in different weather or ground conditions.