https://clips-media-aka.warnermediacdn.com/cnn/clips/2021-03/178423-1a03384951374e4bbc27b860a2858da7/mp4/cms3-CNN-expedia-ceo-peter-kern-travel-pandemic-primary-76981-178423-1920x1080_8000k.mp4 Expedia Group travel company prepares for a post-pandemic influx in travel by allowing fliers to carry digital a health certificate also known as a vaccine passport. The copmapy's CEO Peter Kern explains. Source: CNN, CNN BUSINESS