<human>:  How does weather affect airplanes?
<bot>: Weather can have a major effect on the ability of airplanes to fly safely. Poor weather conditions such as strong winds, heavy rain, snow, ice, and fog can make it difficult or even impossible for airplanes to take off or land safely. Additionally, turbulence caused by changing wind conditions or other weather factors can cause discomfort and potential safety risks for passengers. Poor visibility also reduces the pilot's ability to navigate safely. As such, it is important for pilots to stay up to date on the forecasts and plan their routes accordingly.