How Covid-19 could change plane boarding - BBC

"All of a sudden, airlines and airports must scramble for new solutions to reduce the risk of virus transmission, while boarding passengers as quickly as possible. From a coronavirus perspective, boarding is one of the riskiest parts of taking a flight. The airport terminal itself gives passengers room to spread out, while on board the plane, you’re surprisingly safe, providing the engine is running. Cabin air is entirely refreshed every five minutes or so and filtered using hospital-grade HEPA filters, which remove more than 99% of viruses and bacteria attached to droplets. But during boarding, passengers are in close contact with one another, often in poorly ventilated spaces like the plane’s aisle or the walkway, also known as a jet bridge. "