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Many Delta aircraft, including all of our international widebodies, plus many narrowbodies including 737s, 757s, A220s, A319s, A320s and A321s, are equipped with state-of-the-art air circulation systems, blending fresh outside air that is sterilized with a high-temperature compressor and ozone purifier with existing cabin air that has been recirculated through an industrial-grade HEPA filter. HEPA air filters extract more than 99.999% of even the tiniest viruses, as small as 0.01 micrometers. Coronaviruses, which range from 0.08 to 0.16 micrometers in size, are filtered by the HEPA filter. Delta's 717s use 100% fresh outside air.

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