Air France has said that Flight AF 447 sent an automatic signal indicating electrical problems while going through strong turbulence early in its 11-hour flight from Rio de Janeiro to Charles de Gaulle airport in Paris.

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Bernanke is worried about the parlous state of the de-leveraging U.S. economy, and possibly worried that the U.S. banking sector is not strong enough to weather more currency turbulence.

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"In particular, these simulations will enable us to understand the complexities associated with strong coupling between fuel chemistry and turbulence at low preignition temperatures, " noted team member Jacqueline Chen of Sandia National Laboratories.

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Its strong balance sheet should enable it to increase book value despite economic turbulence.

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