Stickers indicate to passengers to maintain a required social distancing at Brussels Airport, in Zaventem, on June 15, 2020 as Brussels Airport reopens for travels within Europe and the Schengen zone, after a months-long closure aimed at stemming the spread of the COVID-19 pandemic, caused by the novel coronavirus. (Photo by Kenzo TRIBOUILLARD / AFP) (Photo by KENZO TRIBOUILLARD/AFP via Getty Images)