Goodbye empty middle seats. Delta is selling the whole plane starting May 1

FILE - In this Wednesday, Feb. 3, 2021, file photo, a passenger wears a face mask she travels on a Delta Air Lines flight after taking off from Hartsfield-Jackson International Airport in Atlanta. Airlines are dropping some of the temporary service changes they made during the early part of the coronavirus pandemic. Delta is the only airline still blocking middle seats, but there's no guarantee that'll continue past April 30. (AP Photo/Charlie Riedel, File)

(CNN) — The empty middle seat on airplanes, one of the few advantages of pandemic, is about to disappear.

Delta Air Lines, the last remaining US airline to keep middle seats unbooked, has lifted that prohibition as of May 1, the company announced Wednesday. It is another sign of a rebound in demand for air travel and greater willingness of people to resume pre-pandemic activities.

“As vaccinations become more widespread, consumer demand and behaviors show us that confidence in travel is on the rise and customers are ready to reclaim their lives,” said Delta’s statement Wednesday.

Airlines have insisted that even with the planes fully booked, measures they have taken during the pandemic have greatly reduced the threat of Covid-19 being spread among passengers. Those provisions include frequent exchange of fresh air in the cabin, enhanced cleaning measures and a requirement that passengers wear masks.

Expanded vaccine availability factored into Delta’s decision. Delta CEO Ed Bastian said the company’s research shows that 65% of its pre-pandemic passenger base anticipate having at least dose of the vaccine by May 1.

In the early days of the pandemic, when demand for flights ground to a near halt, all the airlines were keeping the middle seats open as a way to promote social distancing and increase customer confidence in flying. But most of the other airlines started filling the seats last summer.

Delta’s move is not a surprise given that the airline had previously said it would keep the prohibition in place only through April 30. People booking flights on May 1 and later have already seen the middle seat available for seat selection on the Delta website.

The airline has not broken down the cost of keeping the seat open longer than other airlines.

“It’s expensive. No question about it,” Bastian told CNN’s Poppy Harlow in February. But the cost of keeping the middle seat open is partly offset by higher fares that Delta has been able to charge, he added.

The amount that Delta passengers paid on average for every mile traveled in the final three months of the year was down only 3% from the pre-pandemic period a year earlier. That’s significantly better than that of the other three major US airlines — American Airlines, United and Southwest — fares for which declined between 15% and 19%.

“People are prioritizing, as they should, their health and safety and comfort as they travel,” Bastian told CNN in February. “And we’re getting a meaningful premium for travel on Delta.”