After doing some digging, what you say may be true. The claim is that the footage going around is the "original" footage, with mainstream adding the plane in. I won't claim either way because both are possible. What I do know is that its infinitely easier to get the effect right adding it in than removing it. Removing an already existing plane would require intensive frame-by-frame work. At the end of the day the footage just makes me think but doesn't directly answer any questions.