Rep. Tom Petri, R-Wis., sent a letter to the chairman and CEO of LightSquared after the company placed an ad in The Wall Street Journal. Plans for a LightSquared wireless network have been delayed because of interference issues with GPS used in aviation and other industries. "The U.S. Department of Transportation has stated the GPS interference could result in almost 800 aviation fatalities and cost over $100 billion," wrote Petri, who serves as chairman of the House Aviation Subcommittee.

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