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Employees work in the cargo hold of a Boeing 737 MAX 9 test plane outside the company's factory, on March 14, 2019 in Renton, Washington.

Check out the companies making headlines in midday trading.

Delta, United, American Airlines, Boeing — Airline stocks fell in tandem as concerns about a rebound in Covid-19 cases intensified.  Shares of Delta fell more 3.7%, American Airlines shares lost 4.1% and United shares declined 5.5%. Aircraft manufacturer Boeing's stock also fell 4.9%. Covid cases have ticked up in the U.S. this month with the delta variant spreading among the unvaccinated.

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