I think that airplane travel is a huge challenge to many people. In my experience, airplane seats are generally uncomfortable, airplane food largely inedible, and human beings who are physically designed to get a certain amount of sleep each day are deprived of what is a bodily necessity. In addition, there are the many challenges of international travel to face at a time when one is exhausted and confused. The pandemic certainly made all this much worse, adding a new physical threat and confusing regulations to the usual mental and bodily stress. I am surprised that more travellers did not break down under these pressures, at least, on the planes on which I travelled.