Basically yes. Depending on the flavor of CTer you have, you ask them about the fate of the people and the pilots who were killed (or "killed") on the plane.
If they claim the flights were landed and replaced with remote control jets, you ask where are the people who were supposedly killed on the flights? What about their families? The people either agreed to never contact anyone they knew ever again, or they have to bring every family member and friend of every person into conspiracy. That's easily into the tens of thousands of people.
If they claim the passengers were just murdered, you ask about the pilots. Did they agree to allow their planes to be crashed? If the pilots were made-up people, or government agents, who played the "part" of the pilots for decades? Who are all the flight attendants and Airline managerial people who vouched for the existence and death of these pilots?
And so on and so forth...if they're actually stupid enough to try and answer the question...you quickly reduce them to either insanity or stuttering.