Consider the following premises. If it is overcast, then Thomas is a sailor. If it is overcast, then Michael is taking a plane. If Michael takes a plane, then it is overcast. If Thomas were a sailor, then Michael is taking a plane. Can we infer the following from them? If we can, name the inference rule being used: If is not true that it is overcast if and only if Michael is taking a plane.
That contradicts the premises. Therefore the answer is no.