So the project manager for the 9/11 false flag operation has to find a large team of construction workers, engineers and demolition experts and approach them and say "Here's what we would like you to do - betray your country and murder thousands of your fellow citizens in cold blood and never tell anyone for the rest of your life. But if you don't want to be involved, just don't tell anybody that we asked you, OK?".
And hundreds, if not thousands, all reply "Sure, no problem".
I don't think so.
And they approach two airlines and say "we need you to falsify some information for us so that we can murder thousands of Americans in cold blood"
And the airlines say "Sure, any help we can give you just ask".
And in turn they say to their employees in accounts, IT, flight planning etc "Hey, here is a list of information we need you to falsify so that the Government can murder thousands of Americans in cold blood. Just don't ever tell anyone about this."
As Allen773 says in the OP, very plausible.
SECRET BLACK-OPS MEETING TRANSCRIPT:
Mr.X : The plan is to fake an attack on the US by flying four jumbo jets into specific targets.
Col. Y: What are the targets?
Mr. X: Both towers of the WTC in New York, the Pentagon, and a field somewhere in Pennsylvania.
Col. Y: Okay, what? Why crash a plane into Pennsylvania?
Mr.X: I'll get to that. Phase 1 will be the crashes, and Phase 2 will be the collapse of the buildings using controlled demolition.
Col Y: Are you nuts? Why not rig the buildings with explosives and set them off instead of flying jumbo jets into them?
Mr.X: We need a believable narrative?
Col Y: What kind of narrative?
Mr.X: We plan to invade Afghanistan and Iraq under the cover of these attacks. Those buildings need to come down.
Col Y: Why isn't crashing jets into the targets enough?
Mr X: We need the visuals, footage of the towers collapsing will be played over and over enraging the American people until they demand revenge.
Col Y: Okay. And we frame Iraqi Republican Guards and the Taliban for the attacks?
Mr.X: No, we'll frame Egyptians, Saudis, and everyone but Iraqis?
Col Y: But you said we're using the attacks as an excuse to invade Iraq and Afghanistan? Why aren't we going to frame their governments?
Mr X: Too obvious.
Col Y: But won't the American people prefer we deal with the Saudis?
Mr.X: Leave that to me.
Col Y: Okay, so we invade Iraq and Afghanistan a week after the attack, right?
Mr X: No, fool, we invade Afghanistan first because we're framing Al Qaeda.
Col Y: Why not just strike Al Qaeda now? They bombed two of our embassies and the USS Cole. Why not just fake an intelligence report that they're planning a big strike in the US and then thwack them and invade Afghanistan under that pretense?
Mr X: We need dead Americans.
Col Y: When do we invade Iraq?
Mr X: Two years later. We're going to claim that they're stockpiling WMD's.
Col Y: They don't have any WMD's. Are we going to fly in some of our chemical stockpile to plant in Iraq?
Mr X: No.
Col Y: So we're going to wire three buildings with demo charges and fly jumbo jets - not hijacked by Iraqis or Afghans - into these targets to invade two countries...because why?
Mr X: Money and control.
Col Y: My kid is at Harvard and he says the money will be in something called Social Media.
Mr X: No, war is the answer (twirls mustache).