Is the premise sufficiently strong to logically lead to the hypothesis? Premise: At 8:51, the controller noticed the transponder change from United 175 and tried to contact the aircraft. Hypothesis: The transponder code changed and the controller was eventually able to contact them.
At 8:51, the controller noticed the transponder change from United 175 and tried to contact the aircraft.###The transponder code changed and the controller was eventually able to contact them.