The travel industry on Friday applauded new guidance from the Centers for Disease Control and Prevention that said Americans who are fully vaccinated against Covid-19 could travel at low risk to themselves as likely to help ailing businesses and encourage more Americans to board flights, cruises, buses and trains.

“The C.D.C.’s new travel guidance is a major step in the right direction that is supported by the science and will take the brakes off the industry that has been hardest hit by the fallout of Covid by far,” Roger Dow, the chief executive of U.S. Travel, an industry group, said in a statement. “As travel comes back, U.S. jobs come back.”

But while the news may be a boon to the industry, its concerns are far from over.

Most airlines, hotels and tourist destinations have suffered mounting losses for more than a year as Americans largely stayed home. Travel is beginning to recover, but many of these businesses won’t see meaningful profits for months, at least.

More generally, the pandemic has also shown businesses large and small that their employees can often be just as productive working remotely as in face-to-face meetings. As a result, the airline and hotel industries expect it will be years before lucrative corporate travel returns to pre-pandemic levels, leaving a gaping hole in revenues.