PANDEMIC NEWS UPDATE: AIAA SciTech goes virtual; NASA-designed ventilators to be produced in Brazil; Lufthansa tightens rules for mask exemptions; U.S. airlines brace for layoffs


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PANDEMIC NEWS UPDATE: AIAA SciTech goes virtual; NASA-designed ventilators to be produced in Brazil; Lufthansa tightens rules for mask exemptions; U.S. airlines brace for layoffs