“Defense should do relatively better [than consumer sectors], but it’s not gonna be immune,” said Byron Callan, a policy research expert at Capital Alpha Partners. “It’s gonna catch a mild fever where, you know, there are gonna be other parts of the U.S. economy that are gonna be in a critical situation."

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Short of factory closings, factory workers staying home for school closures or to care for sick relatives could trigger work slow downs, particularly at the lower tiers of the supply chain, especially the ones that rely on smaller pools of workers. Those companies could suffer too if they rely on the commercial side of the aerospace sector, which is expected to be harder hit, Callan said.

“You can see the ramifications on the pace of work, but it’s not like the airline industry or the cruise ship industry where all of a sudden none of your customers show up,” Callan said, adding: “There could be a cascading effect from some commercial aerospace. Again, it’s at very, very small level, but it’s still a factor.”

“A decision to build the aircraft in the U.S. would likely only be undertaken if Boeing/Embraer could sell KC-390 to the [U.S.] Air Force, Navy, or Marine Corps,” wrote Byron Callan of Capital Alpha Partners in an email.