Consider the premise. Does the hypothesis naturally and logically follow? Premise: He then discovered, to his surprise, that the Langley fighters were not headed north toward the Baltimore area as instructed, but east over the ocean. Hypothesis: The fighters were going in the wrong direction. 
He then discovered, to his surprise, that the Langley fighters were not headed north toward the Baltimore area as instructed, but east over the ocean.###The fighters were going in the wrong direction. 