Anderson added that Delta, which owns Northwest, has followed all guidelines set by the government since the 1996 mid-air explosion of TWA Flight 800 -- which killed all 230 people aboard -- and the September 11, 2001, terror attacks.

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CNN's Brent Sadler -- who was back in Belgrade after some international journalists were forced to leave Yugoslavia earlier -- heard one explosion outside Belgrade Saturday as air raid sirens rang out in the Yugoslav capital.

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If true, that would rule out an in-flight explosion as the cause of the crash of Air France Flight 447, Defense Minister Nelson Jobim told reporters.

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Janan Dawar, an eyewitness who lives about 14km (nine miles) away from the checkpoint, said he had heard a huge explosion and had seen flames leap into the air.

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Alerted by the disruption caused to all air traffic by the Iceland volcano dust explosion in April 2010 to the power of using social media to communicate with frustrated passengers, KLM started intercepting their customers' Tweets and Facebook remarks and dreaming up little surprise, individualised gifts or events - when, at least, some of them travel.

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She pieced the debris into a spectral constellation suspended in mid-air that seems to freeze-frame the explosion, stopping time in its tracks.

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The initial explosion sent a wave of fire and debris hurtling through the air to two rows of homes nearby.

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