No Airplanes?
Aside from this site
history of the "No Planes on 9/11" hoaxes
sufficiently debunking the dumbass statement that 'there were no planes', it's rather easy to do some elementary research yourself (as I did).
4 planes were allegedly involved:
United Airlines Flight 175 (
N612UA)
American Airlines Flight 77 (
N644AA)
American Airlines Flight 11 (
N334AA)
United Airlines Flight 93 (
N591UA)
Those numbers at the lines above are the planes' Tail Numbers - unique identifiers to help search for references to given planes.
There's a site called Airliners.net that I have been using for years (being an airline brat myself), and using the information above - I have taken the liberty of making the above planes' numbers into actual links taking you to the relevant airliners.net listing of pictures and dates of each of the planes' histories.
These are pictures, and dates, collected of these given airplanes, at various airports, and moments of their history.
So much for the planes not existing.
Next.