In 1994 another plane crashed near Pittsburgh. This was USAir Flight 427. Below is the press release that was put out immediately after the crash:

External Source

USAir Flt. 427 Crashes Near Pittsburgh Chicago, IL, September 9, 1994, (ENN) 2130CDT -- Reports from both emergency service personnel and official sources indicate that a USAir 737-300 aircraft, enroute from Chicago to Pittsburg, has crashed into a field Northwest of Pittsburg International. The plane, Flt. 427, was scheduled to arrive in Pittsburg at 7:09 p.m. (local time). Neither the FAA nor Pittsburg International airport have reported any distress signal being recieved from the striken aircraft. Eyewitness reports from the scene indicate that the plane banked and dove directly into the ground, then burst into flames. All 131 passengers and crew have apparently perished in the crash.

Rescuers from Hopewell Township have described the scene as "gruesome" with "body parts hanging from the trees". The largest piece of the plane, that is left intact, is believed to be the tail and it is described as being a piece of slivered metal about the size of a person. Bits of baggage, shredded parts of the plane, and severed limbs are reportedly strewn over a large area. Rescuers are believed to be hampered by darkness and the rugged terrain in the area of the crash.

Unconfirmed reports have suggested that the plane had exploded prior to impacting the ground, which would account for the debris being spread over a very wide area. Other eyewitnesses have said that it "dove into the ground under full power". Contradictory reports continue to be received as additional witnesses are interviewed. The FAA has ordered the scene sealed, and it is being surrounded by local and state police officials. CBS News is reporting that the FBI has been called in to the case because of the mysterious circumstances under which the plane crashed. At least one unconfirmed report said that the possibility of sabotage exists and that the explosion may have been altitude detonated.

www.emergency.com

Note the similarities to Flight 427 and Flight 93. Flight 427 apparently turned upside down and dove straight into the ground, exactly how Flight 93 was described to have crashed.

However, note the differences. When Flight 427 crashed, body parts were hanging from the trees, and severed limbs were spread over a large area. In contrast, the coroner on the scene where Flight 93 is said to have crashed stated that he didn't see one drop of blood.

Why such a big difference between crash sites?