I don't think this shows there were no planes. This could just as easily have been an edit as part of a disinformation campaign. It's very easy to remove a plane from a video.

To your general point: but does this mean we should automatically doubt everything we're told, even when there are arguments to believe it? For example, the idea that a virus is making people sick all around the globe, and relatively severely as well. (Perhaps less so now than during the past few years.) I have first-hand account of sickness within my environment; I'm not going to doubt that. (This includes someone losing their condition for several months.) And what we're being told are mutations of the virus all appear to bring their own unique set of symptoms. These differ from how we've become sick in the past. Are we going to assume all of this is induced by EM waves, or some other technology, just to hold on to our state of doubting by default? At one point it becomes convincing. And whether a virus is making people ill, or 5G, or something else, matters just as little as whether or not planes were used on 9/11. The much more important and outrageous point is that the billionaires have begun making people sick en masse.