I'll start an answer and then turn it over to one of my colleagues, who have been working very closely with this sector on exactly these types of issues.
I'll say that it's clearly recognized that on an airplane physical distancing is a challenge. Consequently, that's why we put measures in place, for instance, such as the questions—the symptomatic screening questions and the observations—as well as the mandatory use of face coverings or face masks on the airplane where that physical distancing isn't possible. We've approached this and provided a layering process and system whereby measures actually build on each other, and there's not one individual measure that stands on its own, but a number of measures that have to work in concert to be able to ensure or minimize the risk of transmission of the virus during flight.
We're currently working with the aviation sector in developing a guidance document that is all-encompassing and that will use, for instance, the International Civil Aviation Organization as a baseline standard for best practices in the aviation sector.