Consider the following premises. It is not windy. If Charles takes a plane, then it is cloudy. If it is cloudy, then Elisabeth is fast. If Elisabeth were fast, then it is windy. Can we infer the following from them? Charles is not taking a plane.
 From the fact that if it is cloudy, then Elisabeth is fast, and that if Elisabeth were fast, then it is windy we can infer that if it is cloudy, then it is windy. From the fact that if it is cloudy, then it is windy, and that it is not windy we can infer that it is not cloudy. Finally, from the fact that if Charles takes a plane, then it is cloudy, and that it is not cloudy we can infer that Charles is not taking a plane. Therefore, the answer is yes.