2/12/2008

Two large U.S. airlines are improving efforts to prevent ice from accumulating in the fuel systems of their jetliners. In the U.K., investigators are still looking into whether ice crystals may have clogged the fuel system of a jetliner that crash landed near London in January. United Airlines is reassessing certain quality-control systems, and American Airlines is determining whether a different type of jet fuel could better withstand cold temperatures.

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