Could a vaccine passport soon be your ticket to a quarantine-free vacation?

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Needing documents to travel is nothing new — after all, checking in for a flight requires some form of ID and, if you’re bound for somewhere foreign, it’ll have to be a passport. The same goes for car or train trips that cross the U.S. border, where from 2023 you’ll need that iconic blue booklet or a state-issued Real ID.But a passport to simply check into a hotel or board a cruise ship? It’s a distinct possibility in this age of pandemic-related restrictions.

The idea of so-called vaccine passports proving inoculation against Covid-19 is gaining momentum in some quarters, as consumer interest in travel and tourism picks up along with the pace of vaccination.Nearly half, or 46%, of vaccinated Americans plan to travel this summer, according to marketing software company Redpoint Global. And once more travel restrictions are lifted, 79% of them plan to travel as often or more as they did pre-pandemic. With more than 105 million Americans more...