@Edward_Morling @AndreTI @TheWisestHuman @NateSilver538 It's not just the plane, it is shuttle busses, rest rooms, various waiting areas, queues, and crowding. All of these involve exposure (often close contact exposure) with a new set of people. Travel has many opportunities for spread apart from ON THE PLANE.
@Edward_Morling@AndreTI@TheWisestHuman@NateSilver538不仅仅是飞机，还有穿梭巴士、休息室、各种等候区、排队和拥挤。所有这些都涉及与一群新的人接触（通常是近距离接触）。除了在飞机上，旅行还有很多传播的机会。