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First implemented in the 1950s, radar remains the basis of the technology used by more than 15,000 U.S. controllers to guide 50,000 flights a day. A new program would replace ground radar stations with satellite-based technology. (Associated Press)

First implemented in the 1950s, radar remains the basis of the technology used by more than 15,000 U.S. controllers to guide 50,000 flights a day. A new program would replace ground radar stations with satellite-based technology. (Associated Press)

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