Even as the coronavirus pandemic continues to rage in many corners of the world, places that have successfully vaccinated a substantial share of the population are plotting the next step: how to let people start traveling again, whether for beach vacations or board meetings.

By early summer, countries of the European Union and beyond aim to issue vaccine passports that would let those who have been inoculated freely cross borders. Some places—Australia and New Zealand, for instance, and Singapore and Hong Kong—are joining together to create “travel bubbles” that allow citizens to visit without mandatory quarantines. And governments are drawing up lists of vaccines and tests they deem sufficiently effective to permit entry.

Airlines are adding flights and filling out schedules in anticipation of increasing numbers of vacationers. Hotels are airing out rooms and dusting off the furniture, hoping for at least a modest rebound after a year of little to no business. Restaurants in vacation destinations—those that have managed to survive—are restocking kitchens and bars as diners start trickling back to their tables and terraces.

“There’s optimism that we're getting a little closer to seeing some form of travel this summer, especially in the trans-Atlantic market,” said John Strickland, owner of aviation advisory firm JLS Consulting in London. “Airlines have done a lot of the spade work on digital travel passports and testing, and there's a huge impetus on governments to get some travel going.”

That’s not to say things will get back to normal anytime soon. India is in the grips of the worst wave of the pandemic seen anywhere, with more than 300,000 new cases reported every day. Scores of countries have yet to inoculate even 1% of their population and new variants have emerged that threaten to render today’s vaccines ineffective. And the U.S. has put 80% of the world's countries on a no-go list.

Any opening could be slowed by the implementation of rules by some countries that allow only people with certain vaccines to enter. The EU says it will guarantee access solely to those with vaccines approved by the bloc’s medical authority—though it has encouraged individual countries to accept any shot approved by the World Health Organization, according to a draft of rules seen by Bloomberg. And China will only admit people who have been inoculated with shots from its pharmaceutical companies—which haven’t been approved in Europe, the U.S., and many other places.

Yet travel companies are betting that this summer will be a big improvement over last year’s bust. Airlines aim to expand capacity on international flights by a third between now and July, according to data compiled by BloombergNEF (though carriers have consistently laid out ambitious plans only to pare them back because of new travel restrictions). United Airlines Holdings Inc., for instance, is adding new seasonal routes to Athens, Dubrovnik, and Reykjavik—places expected to be open to U.S. tourists this summer. American Airlines expects to fly more than 90% of its 2019 domestic seat capacity and 80% of international this summer, about double the level in the summer of 2020.

The trend has given a lift to shares in airlines, with Deutsche Lufthansa AG rising as much as 5% on Monday and IAG SA, the owner of British Airways, gaining 4.9%. United Airlines advanced 1.2% in pre-market U.S. trading.

With passengers still leery of cramming into coach, business class seats are becoming a more popular choice for those who decide to fly. As business travel slumped over the past year, carriers reduced fares for the front of the plane, and vacationers are more often choosing them, as much for social distance as for free Champagne. “We’re going to see the emergence of the premium leisure market,” Virgin Atlantic Airways Ltd. Chief Executive Officer Shai Weiss said on Bloomberg Television. “People have saved a lot of money.”

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