Consider the following premises. For all x_12, if x_12 were a mechanic, then x_12 is taking a plane. For all x_12, if x_12 were excited, then x_12 is taking a plane. For all x_12, if x_12 takes a plane, then x_12 is a doctor. For all x_12, x_12 is a mechanic or x_12 is excited. For all x_12, if x_12 were a doctor, then x_12 is a soldier. Can we infer the following from them? For all x_12, if x_12 were a mechanic, then x_12 is taking a plane.
That is one of the premises. Therefore, the answer is yes.