SIGMETs are issued to warn which type of aircraft?

SIGMETs, or Significant Meteorological Information, are critical weather advisories issued primarily for the safety of all aircraft, regardless of their type or operation. These alerts are designed to provide information about significant weather phenomena that could pose hazards in flight, such as thunderstorms, turbulence, icing, or volcanic ash. The universal nature of SIGMETs emphasizes their importance in ensuring that both commercial and private pilots are informed about potentially dangerous weather conditions. This broad applicability highlights the need for all pilots to remain aware of the weather situation, as adverse conditions can affect any aircraft irrespective of its operational role. Therefore, the correct answer reflects the inclusive nature of SIGMETs, which are intended for everyone in aviation.