A-10 Warthog/Thunderbolt was flying very low over the crash site at exactly the moment the explosion, fireball occurred.

Susan Mcelwain - who lives two miles from the site, knows what she saw - the white plane rocketed directly over her head. "It came right over me, I reckon just 40 or 50ft above my mini-van," she recalled. "It was so low I ducked instinctively. It was traveling real fast, but hardly made any sound. "Then it disappeared behind some trees. A few seconds later I heard this great explosion and saw this fireball rise up over the trees, so I figured the jet had crashed. The ground really shook. So I dialed 911 and told them what happened. "I'd heard nothing about the other attacks and it was only when I got home and saw the TV that I realized it wasn't the white jet, but Flight 93. I didn't think much more about it until the authorities started to say there had been no other plane. The plane I saw was heading right to the point where Flight 93 crashed and must have been there at the very moment it came down.

"There's no way I imagined this plane - it was so low it was virtually on top of me. It was white with no markings but it was definitely military, it just had that look. "It had two rear engines, a big fin on the back like a spoiler on the back of a car and with two upright fins at the side."

"The FBI came and talked to me and said there was no plane around. Then they changed their story and tried to say it was a plane taking pictures of the crash 3,000ft up. But I saw it and it was there before the crash and it was 40ft above my head. They did not want my story."

Link:
http://www.globalresearch.ca/articles/WAL403A.html

A10 Thunderbolt/Warthog Ground Attack plane: "It had two rear engines, a big fin on the back like a spoiler on the back of a car and with two upright fins at the side." (Did this attack the ground and make the crater?)

Imagine the odds of her describing an A-10 when she doesn't know what one is - Zero!

I found photos of a White A-10: On this site:
http://www.cs.virginia.edu/~robins/summer_gallery.html

Many Eye witnesses saw same rear-engined white plane

Tom Spinelli, 28 - was working at India Lake Marina, a mile and a half away. "I saw the white plane," he said. "It was flying around all over the place like it was looking for something. I saw it before and after the crash." -Daily Mirror (9/13/02)

Dale Browning "It's the damndest darn thing," said Dale Browning, a farmer. "Everybody's seen this thing in the sky, but no one can tell us what it is." -The Bergen Record (9/14/01)

Rick Chaney: Chaney described the plane as a Lear-jet type, with engines mounted near the tail and painted white with no identifying markings. -The Bergen Record (9/14/01)

Dennis Decker "As soon as we looked up, we saw a midsized jet flying low and fast," Decker said. "It appeared to make a loop or part of a circle, and then it turned fast and headed out." Decker and Chaney described the plane as a Lear-jet type, with engines mounted near the tail and painted white with no identifying markings. -The Bergen Record (9/14/01)

Decker/Chaney confusion: Learjet and A10 Thunderbolt/Warthog side-by-side: (Susan Mcelwain saw the plane LOW)
http://i11.tinypic.com/62eewzp.jpg

Susan Custersaid she saw a small white jet streaking overhead. -The Bergen Record (9/14/01)

Robin Doppstadt was working inside her family food-and-supply store when she heard the crash. When she went outside, she said, she saw a small white jet that looked like it was making a single circle over the crash site. "Then it climbed very quickly and took off. "

The A10 doing what it was designed to do - ground attack:
http://www.youtube.com/watch?v=WnyHQXDhvjI