I agree that it's a bit of a tall order, but I think you will find flight attendants will be instructed to tell people not to queue for a toilet, etc, and to remain in their seat as much as possible. Whether that's practical in reality or not, we will see. But other airlines overseas have been trying to do this for a while yet.
I was specifically talking about aircraft. I am not an expert myself but have been informed by experts on this subject, who have pointed out that transmission in aircraft is way less than in other large crowd settings - actually airports are the big concern because of the frequent mixing of many people (meaning a super-spreader can be in contact with way more people), and poor ventilation. Aircraft have ventilation systems way superior to any restaurant or general building, with HEPA filters that catch the virus. Hence the risk is primarily from people near you, it won't transmit through the ventilation systems or air currents like those other situations. As with everything, there's always an exception and nothing is perfect, but the game here is reducing the risk where possible.
And I certainly do have facts backing this up - here is a good overview article with links to peer-reviewed studies:
Cabin Air & Low Risk of On Board Transmission