[tilmprarnerit]

I am guessing you got most of this information from the video loose change. Lets take a look at your first question.

1. Why on the home videos made by people on the ground, the planes that hit the towers did not have windows?

I have never seen a clear video that conclusively shows that the planes that hit the towers did not have windows. These claims are usually associated with reports that the planes where cargo planes. Where did this information come from then? The man who makes these claims in the loose change video, Marc Birnbach, was over two miles away from the towers and did not have a good view of the airplanes. Here is the excerpt from the popular mechanics article that debunks this story...

Flight 175's Windows
CLAIM: On Sept. 11, FOX News broadcast a live phone interview with FOX employee Marc Birnbach. 911inplanesite.com states that "Bernback" saw the plane "crash into the South Tower." "It definitely did not look like a commercial plane," Birnbach said on air. "I didn't see any windows on the sides."

Coupled with photographs and videos of Flight 175 that lack the resolution to show windows, Birnbach's statement has fueled one of the most widely referenced 9/11 conspiracy theories--specifically, that the South Tower was struck by a military cargo plane or a fuel tanker.

FACT: Birnbach, who was a freelance videographer with FOX News at the time, tells PM that he was more than 2 miles southeast of the WTC, in Brooklyn, when he briefly saw a plane fly over. He says that, in fact, he did not see the plane strike the South Tower; he says he only heard the explosion.

While heading a Federal Emergency Management Agency (FEMA) probe into the collapse of the towers, W. Gene Corley studied the airplane wreckage. A licensed structural engineer with Construction Technology Laboratories, a consulting firm based in Skokie, Ill., Corley and his team photographed aircraft debris on the roof of WTC 5, including a chunk of fuselage that clearly had passenger windows. "It's ... from the United Airlines plane that hit Tower 2," Corley states flatly. In reviewing crash footage taken by an ABC news crew, Corley was able to track the trajectory of the fragments he studied--including a section of the landing gear and part of an engine--as they tore through the South Tower, exited from the building's north side and fell from the sky.

http://www.popularmechanics.com/tech...42.html?page=3

Question 1 has been answered if anyone who care to hear more debunking I can continue...