Consider the premise. Does the hypothesis stand independently without contradicting or following it? Premise: Callers reported that a passenger had been stabbed and that two people were lying on the floor of the cabin, injured or dead-possibly the captain and first officer. Hypothesis: No one called from the airplane at all.  
Callers reported that a passenger had been stabbed and that two people were lying on the floor of the cabin, injured or dead-possibly the captain and first officer.###No one called from the airplane at all.  