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Aviation expert: Major failure aboard aircraft
Aviation expert Alan Diehl discusses what could possibly cause a plane to fall out of the sky at cruising altitude.

03:31 - Source: CNN
Russian plane crash 20 videos
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Aviation expert: Major failure aboard aircraft
03:31
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ISIS claims soda can bomb took down Metrojet plane
03:09
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The wreckage of a A321 Russian airliner in Wadi al-Zolomat, a mountainous area of Egypt's Sinai Peninsula. Russian airline Kogalymavia's flight 9268 crashed en route from Sharm el-Sheikh to Saint Petersburg on October 31, killing all 224 people on board, the vast majority of them Russian tourists. AFP PHOTO / RUSSIA'S EMERGENCY MINISTRY / MAXIM GRIGORYEV *RESTRICTED TO EDITORIAL USE - MANDATORY CREDIT "AFP PHOTO / RUSSIA'S EMERGENCY MINISTRY / MAXIM GRIGORYEV" - NO MARKETING NO ADVERTISING CAMPAIGNS - DISTRIBUTED AS A SERVICE TO CLIENTS *MAXIM GRIGORYEV/AFP/Getty Images
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Russian media: Bomb brought down Metrojet flight
02:38
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What does plane audio reveal about crash?
02:35
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Russians remembering the victims of Metrojet crash
02:30
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Debris belonging to the A321 Russian airliner are seen at the site of the crash in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula on November 1, 2015. International investigators began probing why a Russian airliner carrying 224 people crashed in Egypt's Sinai Peninsula, killing everyone on board, as rescue workers widened their search for missing victims. AFP PHOTO / KHALED DESOUKI (Photo credit should read KHALED DESOUKI/AFP/Getty Images)
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Egypt: Noise heard before plane broke apart
02:42
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In this Russian Emergency Situations Ministry photo, made available on Monday, Nov. 2, 2015 Russian and Egyptian experts work at the crash site of a Russian passenger plane bound for St. Petersburg in Russia that crashed in Hassana, Egypt's Sinai Peninsula, on Monday, Nov. 2, 2015. A Russian cargo plane on Monday brought the first bodies of Russian victims home to St. Petersburg, from Egypt.(Russian Ministry for Emergency Situations photo via AP)
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Report: Egypt plane crash likely not an accident
03:00
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Report: UK flight had close call with rocket in August
02:55
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2015-11-06 17:08:36
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Egypt: Tight security measures in Sharm el-Sheikh
01:56
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HANOVER, GERMANY - APRIL 08: Russian President Vladimir Putin and German Chancellor Angela Merkel (not pictured) speak to the media after touring the Hannover Messe 2013 industrial trade fair on April 8, 2013 in Hanover, Germany. Merkel and Putin toured the fair, which is the world's largest industry trade fair and has partnered this year with Russia. (Photo by Sean Gallup/Getty Images)
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Will Putin go after terrorists in Egypt?
01:42
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Report: Black boxes indicate no accident
01:42
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CHICAGO, IL - SEPTEMBER 24: Passengers wait in line to go through security screening at O'Hare International Airport's Terminal 1 shortly after the terminal was reopened on September 24, 2014 in Chicago, Illinois. The ticketing and baggage claim areas of the terminal were evacuated for nearly two hours after a after an unattended bag was discovered around 9:30 this morning. (Photo by Scott Olson/Getty Images)
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Airport security varies around the world
01:07
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Vladimir Putin delivers message to Russia
02:03
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U.S. President Barack Obama speaks at the Rutgers University-Newark S.I. Newhouse Center for Law and Justice on November 2, 2015 in Newark, New Jersey.
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President Obama: 'Possibility' of bomb on Russian plane
02:20
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Data shows steep, unrecoverable decent of Russian plane
01:58
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Debris belonging to the A321 Russian airliner areseen at the site of the crash November 1.
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Egypt: 'Premature' to draw conclusion about plane crash
01:53
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U.S. official: ISIS likely brought down Russian jet
02:20
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Egyptian army soldiers stand guard next to the plane nose of a crashed A321 Russian airliner at the site of the wreckage in Wadi al-Zolomat, a mountainous area in Egypt's Sinai Peninsula on November 1, 2015. International investigators began probing why a Russian airliner carrying 224 people crashed in Egypt's Sinai Peninsula, killing everyone on board, as rescue workers widened their search for missing victims. AFP PHOTO / KHALED DESOUKI (Photo credit should read KHALED DESOUKI/AFP/Getty Images)
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Egypt: Investigation will be honest, independent
03:50
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Heat flash detected as Russian plane crashed
02:32
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Debris of the A321 Russian airliner at the crash site on November 1.
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Aviation official: Russian jet disintegrated in mid-air
03:16
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