The Risk of Aircraft-Acquired SARS-CoV-2 Transmission during Commercial Flights: A Systematic Review

Author:

Zhao Diana1ORCID,Cheng Stephanie1,Tsui Fuchiang R.2ORCID,Mathur Maya B.3,Wang Chih-Hung Jason14ORCID

Affiliation:

1. Center for Policy, Outcomes and Prevention, Department of Pediatrics, Stanford University School of Medicine, Stanford, CA 94305, USA

2. Department of Anesthesiology and Critical Care Medicine, Children’s Hospital of Philadelphia, Philadelphia, PA 19146, USA

3. Quantitative Sciences Unit, Department of Pediatrics, Stanford University, Stanford, CA 94305, USA

4. Center for Health Policy, Freeman-Spogli Institute for International Studies, Stanford University, Stanford, CA 94305, USA

Abstract

The aircraft-acquired transmission of SARS-CoV-2 poses a public health risk. Following PRISMA guidelines, we conducted a systematic review and analysis of articles, published prior to vaccines being available, from 24 January 2020 to 20 April 2021 to identify factors important for transmission. Articles were included if they mentioned index cases and identifiable flight duration, and excluded if they discussed non-commercial aircraft, airflow or transmission models, cases without flight data, or that were unable to determine in-flight transmission. From the 15 articles selected for in-depth review, 50 total flights were analyzed by flight duration both as a categorical variable—short (<3 h), medium (3–6 h), or long flights (>6 h)—and as a continuous variable with case counts modeled by negative binomial regression. Compared to short flights without masking, medium and long flights without masking were associated with 4.66-fold increase (95% CI: [1.01, 21.52]; p < 0.0001) and 25.93-fold increase in incidence rates (95% CI: [4.1, 164]; p < 0.0001), respectively; long flights with enforced masking had no transmission reported. A 1 h increase in flight duration was associated with 1.53-fold (95% CI: [1.19, 1.66]; p < 0.001) increase in the incidence rate ratio (IRR) of cases. Masking should be considered for long flights.

Funder

Stanford University

Publisher

MDPI AG

Reference35 articles.

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2. United Nations (2021, May 13). 2020 Passenger Totals Drop 60 Percent as COVID-19 Assault on International Mobility Continues. Available online: https://www.icao.int/Newsroom/Pages/2020-passenger-totals-drop-60-percent-as-COVID19-assault-on-international-mobility-continues.aspx.

3. OECD (2021, May 13). COVID-19 and the Aviation Industry: Impact and Policy Responses. Available online: https://www.oecd.org/coronavirus/policy-responses/covid-19-and-the-aviation-industry-impact-and-policy-responses-26d521c1/.

4. (2024, May 08). Global Air Travel Demand Continued Its Bounce Back in 2023. Available online: https://www.iata.org/en/pressroom/2024-releases/2024-01-31-02/.

5. (2024, May 08). The Changing Threat of COVID-19|CDC, Available online: https://www.cdc.gov/ncird/whats-new/changing-threat-covid-19.html.

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