"I think there's going to be a renaissance of business travel in our country, not just for the airlines, I think in general," Bastian said.
"Customers have a desire to get back out on the road and reconnect like never before," he said.
Israel's bombardment of Gaza and rocket attacks on Israeli towns ceased after 11 days under an agreement mediated by Egypt, which prompted foreign airlines to suspend services.
We continue to closely monitor the security situation and will make adjustments to our flight schedules as necessary," the spokesperson added.
Earlier, Southwest Airlines and JetBlue Airways also pointed to a steady rise in leisure bookings as signs of a slowing pandemic due to vaccine rollouts drive more people to go on vacations or visit their friends and relatives.
The Atlanta-based company said its medium-term goal is to replace 10% of its jet fuel, which is currently refined from fossil fuel, with sustainable aviation fuel by the end of 2030.
That followed moves in Europe by easyJet to offset emissions on all its flights and by British Airways and Air France to do the same on their domestic flights.
Cantarutti said that after an initial trial period through late January, Delta hoped to leverage data and experience from the flights to help expand those routes to leisure travelers and reach agreements on other destinations.
The airline said it would use the loyalty program as collateral to secure the new loans and issuance, as it continues to burn through about $27 million in cash each day.
US airlines have cut costs and raised debt to survive what they call an unprecedented industry crisis.
One person who reviewed the numbers said they represented around 24% of Southwest pilots and 33% of flight attendants.
American Airlines and United Airlines have also offered voluntary departure deals while together sending more than 60,000 warnings of potential furloughs to their employees.