You laugh but the following photo is proof of other involvement and a cover-up. This is the ONLY photo known showing these details. This exact same image as aired on the news and in documentaries shows none of the inset craft.
That constitutes PROOF that ALL of the other known photos are Photoshopped fakes and that PROVES that government craft and some unknown object were present at 9-11.
Since we know that only NASA was flying the SR-71 at that time it is PROOF that NASA knows exactly what's going on and the public story is simply designed to divert us from asking questions about extraterrestrial involvement.
Here's the photo:
I found this document on the internet so I know it is factual.