![Photo of coronavirus models, passports, an airplane and a stethoscope .](https://flightsafety.org/wp-content/uploads/2020/03/aviationmedicine_mar20_featured.jpg)
Despite a slight month-to-month increase in passenger air travel in June, demand, measured in revenue passenger kilometers (RPKs), was down 60.1 percent from the pre-pandemic level recorded in June 2019, according to data from the International Air Transport Association (IATA).