United has completed the installation of hospital-grade HEPA air filters on its operating fleet of 36 Embraer E145 aircraft. The 50-seat planes are used for United Express-branded flights.
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HEPA filtration systems circulate aircraft air every two to four minutes. Airlines, backed by recent studies, say they substantially reduce the possibility of in-flight Covid-19 transmission.
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Following the E145 retrofits, the only aircraft flown by United or under
the United Express brand that don't have HEPA or HEPA-equivalent
filtrations systems are the roughly 150 Bombardier CRJ-200s operated for United Express by Air Wisconsin and SkyWest, United spokesman Charles Hobart said.
UPDATED: This report was updated to include the fact that SkyWest also flies Bombardier CRJ-200s for United Express.