In this Jan. 26, 2011 file photo, Nielsen Company CEO David Calhoun, center, watches progress as he waits for the company's IPO to begin trading, on the floor of the New York Stock Exchange. Calhoun took over Monday, Jan. 13, 2020, as Boeing's third CEO in the last five years, following the firing last month of Dennis Muilenburg. (AP Photo/Richard Drew, File)
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