SIGMETs are issued as a warning of weather conditions hazardous to which type of aircraft?

SIGMETs, which stands for Significant Meteorological Information, are critical warnings issued by meteorological authorities to inform all pilots about potentially hazardous weather conditions that could impact the safety of flight operations. These hazards can include severe turbulence, thunderstorms, volcanic ash, and other meteorological phenomena that can affect both private and commercial aircraft, as well as military aircraft.

The reason that the correct answer encompasses all aircraft is because safety is a paramount concern in aviation, and SIGMETs are relevant to anyone operating an aircraft. Weather phenomena that are significant enough to warrant a SIGMET do not discriminate between types of aircraft; they can affect any flight, regardless of whether it is a small private plane or a large commercial airliner. Therefore, pilots of all categories of aircraft must be aware of these warnings to ensure safe navigation through potentially dangerous weather conditions.