Today, one of the most important means of spreading diseases around the globe is air travel.

One in four Ashkenazi Jews is a carrier. We want to stop these diseases from spreading.

We still maintain that travel is not to be interrupted in the world at this point of time.

Hong Kong, with its dense population and fluid border with China, had one of the hardest outbreaks to control.

Land bridges were everywhere during the extinction, many species were spreading, and there were many diseases.

Furloughing a bunch of air traffic controllers has a pretty easy-to-predict effect on air travel: It causes delays.