Delta Air Lines posted a $1.2 billion profit for the third quarter, helped by the latest installment of federal pandemic aid for the airline industry, and gave an upbeat forecast for the holiday-dominated fourth quarter.

Still, the airline warned that rising fuel prices will challenge its ability to remain profitable, and it forecast higher labor costs too.

The airline said Wednesday that travel demand is improving after hitting a flat spot when COVID-19 infections in the U.S. jumped over the summer, fueled by the rise of the so-called delta variant.

"We are seeing bookings pick up materially over the past four or five weeks," CEO Ed Bastian said. "As the variant has receded, people are starting to get back out."

Business and international travel continue to lag, however — corporate travel stalled at about 40% of its pre-pandemic level. Airlines are hoping for a boost as more workers return to their offices and as the U.S. relaxes border restrictions in November.

Delta is rebuilding more of its previous schedule. The airline operated at 71% of its 2019 passenger-carrying capacity in the third quarter and expects that to rise to 80% in the fourth quarter. That will help revenue rise slightly, to more than 70% of where it stood in late 2019, the airline forecast.

For the most part, Delta has avoided the high numbers of canceled and delayed flights that have affected rivals, like the meltdown that caused Southwest Airlines to cancel nearly 2,400 flights from Saturday through Monday. Delta had just over 20 cancellations in the same three days, according to FlightAware. In a thinly veiled critique of Southwest, Bastian said Delta has been more conservative about adding flights until it has enough employees to operate them.

"Some carriers have tried to be opportunistic over the course of the pandemic to take market share, and some carriers have been a little more disciplined," he said during an interview. "I think you see the effects."

Delta is also setting its own course on vaccine policy. The company is pushing employees to get vaccinated against COVID-19 and will impose a $200 monthly health insurance surcharge on unvaccinated employees next month.

But unlike its rivals — and in a seeming challenge to the White House — Delta continues to offer regular testing as an alternative to the shots. Major U.S. carriers have government contracts to provide airlift flights, and a recent order by President Joe Biden requires federal contractors to vaccinate their employees by Dec. 8; testing is not an option for contractors and their employees.

Bastian said he has discussed the matter with administration officials, but he declined to detail those talks. He argues that if Delta can ensure that a very high percentage of employees get vaccinated, that should be good enough. He said 90% of Delta employees are already vaccinated and it will be 95% by November.

"Mandates are one way to get people vaccinated," he said. "What we're showing is there are alternative means by which we can get people vaccinated and still meet the substance of the requirements. We will assess if we need to, but I trust we'll be effectively vaccinated."

Delta's third-quarter profit of $1.21 billion was down 19% from the same quarter in 2019. The Atlanta-based carrier received $1.82 billion in federal grants from a special program that Congress and the Trump and Biden administrations approved to cover most of the airline industry's labor costs.

Without that aid and other special items, Delta said it would have earned $216 million, or 30 cents per share. That beat the forecast of 15 cents per share from 17 analysts surveyed by FactSet.

Revenue including from Delta's refinery and investments totaled $9.15 billion, down 27% from the same quarter in 2019. Passenger revenue was off 37%.

Delta expects jet fuel prices to rise the rest of the year and other expenses to jump by 6% to 8% over the same quarter in 2019 on a per-seat basis. Mostly that is the cost of hiring new workers. Airlines that took federal pandemic relief have been barred from furloughing employees, but they offered incentives last year that convinced tens of thousands to quit.

Delta has hired about 8,000 people so far in 2021 and expects to add another 1,000 to 2,000 by year-end, Bastian said.

"We had close to 20,000 of our people retire a year ago, so we are starting to build back," he said.

In premarket trading, shares of Delta slipped 1% to $43.10.

___

David Koenig can be reached at www.twitter.com/airlinewriter