Consider the following premises. For all z_4, if z_4 were a doctor, then z_4 is taking a plane. For all z_4, if z_4 plays tennis, then z_4 is a doctor. For all z_4, z_4 will play tennis if and only if z_4 will take a plane. Can we infer the following from them? If we can, name the inference rule being used: For all z_4, if z_4 plays tennis, then z_4 is a doctor.
That is one of the premises. Therefore, the answer is yes.