You are saying that 19 people got into the cockpit, but that’s not what happened everywhere. The planes that crashed into the World Trade Center in New York had left the airport 20 or 30 minutes earlier. Those people did not have time to take everyone by storm. I think it was the pilot himself who flew directly into the World Trade Center. If I remember correctly, that is what happened. You are talking about the plane that was headed for the Pentagon, the headquarters of the American defence department. But in this case, fights broke out on the plane. To my knowledge, there were no other fights elsewhere. That's my opinion.
On March 1st, 2011. See this statement in context.