In this photo illustration, Travel Pass app of a mobile...

UKRAINE - 2021/03/28: In this photo illustration, Travel Pass app of a mobile application by IATA (International Air Transport Association) seen displayed on a smartphone screen in front of IATA logo. Travel Pass is a new digital 'COVID-19 vaccine passport' by IATA (International Air Transport Association) that let travelers to store and manage their verified certifications for COVID-19 tests or COVID-19 proof of vaccination. (Photo Illustration by Pavlo Gonchar/SOPA Images/LightRocket via Getty Images)