If trying to maintain a low risk of exposure to the coronavirus is on your list of travel musts, you may find yourself buried in tracking data before you purchase a plane ticket. As of Tuesday morning, over 63% of the U.S. population was fully vaccinated against the coronavirus, but some states and territories have inoculated a bigger share of residents than others. Some countries and a couple of domestic destinations – San Francisco and Hawaii’s Maui County – have started to require proof of bo
