Take our survey: npr.org/podcastsurveyDomestic travel is surging as the country reopens, but there is still an international-sized hole in the bottom lines of some U.S. tourism businesses. Would-be foreign visitors are mostly barred from coming stateside as coronavirus travel bans persist — and there have been few concrete answers from the Biden administration on when that will change.And vaccine maker Pfizer has begun talking about providing a coronavirus vaccine booster shot. That could be a huge financial windfall for the pharmaceutical giant, but federal government health groups were quick to say that they're not sure if or when a booster shot will be needed. This episode: congressional correspondent Susan Davis, White House correspondent Tamara Keith, and health correspondent Pien Huang.Connect:Subscribe to the NPR Politics Podcast here.Email the show at nprpolitics@npr.orgJoin the NPR Politics Podcast Facebook Group.Listen to our playlist The NPR Politics Daily Workout.Subscribe to the NPR Politics Newsletter.Find and support your local public radio station.