Consider the following premises. There is at least one x_2 for which if x_2 were poor, then x_2 is taking a plane. For all x_2, x_2 is poor if and only if x_2 will take a plane. Can we infer the following from them? If we can, name the inference rule being used: There is at least one x_2 for which if x_2 were poor, then x_2 is taking a plane.
That is one of the premises. Therefore, the answer is yes.