Shares of Boeing Co. rallied on Wednesday, up more than 7% and on pace for their largest one-day percentage increase since Feb. 24, 2021, when they rose 8.1%. The stock, a Dow Jones Industrial Average component, was the best performer in the Dow and in the S&P 500 index on Wednesday. Boeing shares have lost 35% so far this year, compared with losses of around 16% for the Dow and of about 21% for the S&P.

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