Cathay Pacific Airways, convinced that digital proof of coronavirus vaccination will bring about the return of safe international travel, asked its pilots and crew to try out a new mobile app that showed their vaccination status on a recent flight from Hong Kong to Los Angeles.

New York has rolled out "Excelsior Pass,” billed by the state as "a free, fast and secure way to present digital proof of COVID-19 vaccination” in case reopening sports and entertainment venues require proof of attendees’ status.

And Walmart, the largest private employer in the U.S., is offering electronic verification apps to patients vaccinated in its stores so they "can easily access their vaccine status as needed,” the company says.