July 16, 2008 (11 images)

The recovered wreckage of TWA Flight 800 stands reassembled at the National Transportation Safety Board Training Academy where it is used for training new investigators in Ashburn, Virginia on July 16, 2008. The Boeing 747 crashed into the Atlantic after passing over Long Island Sound and Long Island, New York in 1996, after a flammable mixture of fuel and oxygenated air caused a catastrophic explosion. The Department of Transportation announced that almost all U.S. commercial airliners will be required to install a new air separator to help prevent oxygen from entering an aircrafts' fuel tank, the cause of the TWA Flight 800 disaster. (UPI Photo/Patrick D. McDermott) (UPI Photo/Patrick D. McDermott)

The recovered wreckage of TWA Flight 800 stands reassembled at the National Transportation Safety Board Training Academy where it is used for training new investigators in Ashburn, Virginia on July 16, 2008. The Boeing 747 crashed into the Atlantic after passing over Long Island Sound and Long Island, New York in 1996, after a flammable mixture of fuel and oxygenated air caused a catastrophic explosion. The Department of Transportation announced that almost all U.S. commercial airliners will be required to install a new air separator to help prevent oxygen from entering an aircrafts' fuel tank, the cause of the TWA Flight 800 disaster. (UPI Photo/Patrick D. McDermott) (UPI Photo/Patrick D. McDermott)

The recovered wreckage of TWA Flight 800 stands reassembled at the National Transportation Safety Board Training Academy where it is used for training new investigators in Ashburn, Virginia on July 16, 2008. The Boeing 747 crashed into the Atlantic after passing over Long Island Sound and Long Island, New York in 1996, after a flammable mixture of fuel and oxygenated air caused a catastrophic explosion. The Department of Transportation announced that almost all U.S. commercial airliners will be required to install a new air separator to help prevent oxygen from entering an aircrafts' fuel tank, the cause of the TWA Flight 800 disaster. (UPI Photo/Patrick D. McDermott) (UPI Photo/Patrick D. McDermott)

John Hickey, Director of Aircraft Certification Service for the Federal Aviation Administration, explains how the new air separator, seen in his hand, will be used to help prevent oxygen from entering an aircrafts' fuel tank after a news conference to announce a new rules designed to prevent fuel-tank explosions on passenger jets at the National Transportation Safety Board (NTSB) Training Facility in Ashburn, Virginia on July 16, 2008. The rule requires that within two years all new aircraft must include technology designed to reduce the risk of center fuel tank fires and all aircrafts built after 1991 be retrofitted with it. (UPI Photo/Patrick D. McDermott)