One of the biggest business disruptions of the Covid-19 pandemic has been inability or reluctance to travel. International air travel is down 48% compared with this time last year. And it’s no wonder. Congested airports and long flights packed densely with passengers are enough to induce anxiety about traveling in the best of times. In the age of Covid-19 it can be positively nerve-racking. In what universe does an airplane full of passengers not constitute a “large gathering”?