A family leaves flowers and toys at an entrance of Pulkovo airport outside St. Petersburg, Russia, during a day of national mourning for the plane crash victims. Dmitry Lovetsky/AP hide caption

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Emergency services attend the scene on the A27, where seven people died after a plane crashed into cars on the major road during an aerial display at the Shoreham Airshow in West Sussex. Daniel Leal-Olivas/PA Photos/Landov hide caption

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Officials work on the scene of a vintage airplane that had been piloted by actor Harrison Ford when it crash-landed in March on the Penmar Golf Course in the Venice area of Los Angeles. Federal safety investigators have concluded that a problem with a carburetor part led to engine failure. Damian Dovarganes/AP hide caption

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An image from AFP TV video taken Tuesday shows smoke billowing from scattered debris of the Germanwings Airbus A320 at the crash site in the French Alps above the town of Seyne-les-Alpes, France. Denis Bois/AFP/Getty Images hide caption

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The charred tail section of Delta Flight 191 sits near a runway at Dallas-Fort Worth International Airport in August 1985 after it crashed on approach. Delta quickly retired the "191" designation. Carlos Osorio/AP hide caption

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Passengers move away from Asiana Airlines Flight 214 on Saturday in San Francisco. This photo was taken by a passenger. Eugene Anthony Rah/Reuters/Landov hide caption

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The wreckage of a crashed Lion Air 737 sits in water near the airport in Bali, Indonesia, Saturday, in a photo released by Indonesian police. All 108 people aboard survived the crash. AP hide caption

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This image provided by NASA taken early Friday morning Nov. 5, 2010 shows Hurricane Tomas approximately 175 miles west of Port-au-Prince, Haiti, and moving northeast near 9 mph. Tomas strengthened to a Category One Hurricane overnight with maximum sustained winds now at 80 mph with higher gusts.  NASA hide caption

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