Consider the following premises. William is taking a plane if and only if James is playing tennis. James is playing tennis if and only if it is cold. Can we infer the following from them? If it is cold, then William is taking a plane.
 From the fact that James is playing tennis if and only if it is cold we can infer that if it is cold, then James is playing tennis. From the fact that William is taking a plane if and only if James is playing tennis we can infer that if James plays tennis, then William is taking a plane. Finally, from the fact that if it is cold, then James is playing tennis, and that if James plays tennis, then William is taking a plane we can infer that if it is cold, then William is taking a plane. Therefore, the answer is yes.