Given the premise, is the hypothesis presenting a conflicting viewpoint? Premise: Prior to 9/11, it was understood that an order to shoot down a commercial aircraft would have to be issued by the National Command Authority (a phrase used to describe the president and secretary of defense). Hypothesis: Aircrafts can't be shot down by just anyone. 
Prior to 9/11, it was understood that an order to shoot down a commercial aircraft would have to be issued by the National Command Authority (a phrase used to describe the president and secretary of defense).###Aircrafts can't be shot down by just anyone. 