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
A different level of security is needed in airports with flights that fly directly to the United States.
1:07 • Source: CNN
Russian plane crash 19 videos
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
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ISIS claims soda can bomb took down Metrojet plane
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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
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What does plane audio reveal about crash?
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Russians remembering the victims of Metrojet crash
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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
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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
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Report: UK flight had close call with rocket in August
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2015-11-06 17:08:36
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Egypt: Tight security measures in Sharm el-Sheikh
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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?
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Report: Black boxes indicate no accident
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Vladimir Putin delivers message to Russia
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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
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Data shows steep, unrecoverable decent of Russian plane
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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
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U.S. official: ISIS likely brought down Russian jet
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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)
Egypt: Investigation will be honest, independent
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Heat flash detected as Russian plane crashed
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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
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