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The following is some sound, sensible, advice about how to reduce your risk of being exposed to coronavirus on an aeroplane.
Pombal et al. Risk of COVID-19 During Air Travel. JAMA. Published online October 1, 2020. doi:10.1001/jama.2020.19108
Wear a mask, don’t travel if you feel unwell, and limit carry-on baggage. Keep distance from others wherever possible; report to staff if someone is clearly unwell. If there is an overhead air nozzle, adjust it to point straight at your head and keep it on full. Stay seated if possible, and follow crew instructions. Wash or sanitize hands frequently and avoid touching your face.