Passengers on United Airlines and Cathay Pacific traveling out of Heathrow Airport will begin testing a new ‘COVID passport’ that in the future will check if someone has been vaccinated before they travel. The technology is called CommonPass and will let people travel without being quarantined if they download an app to their phone which contains a negative COVID test or a vaccine certificate: https://humansarefree.com/2020/10/airports-covid-passport-vaccinated-before-travel.html