Delta Air Lines reported a $5.4 billion net loss for the third quarter after the pandemic roiled what is usually the peak travel period of the year.

According to NBC News, the airline’s revenue dropped by more than 75 percent from $12.56 billion one year ago to $3.06 billion in the three months ended Sept. 30.

Delta’s president cautioned revenues may not normalize “for two years or more.”

In premarket trading, the airline’s shares were down 2 percent, reported NBC.

Delta Air Lines also posted a wider-than-expected loss during the third quarter.

The airline has spent recent months retiring dozens of aircraft and reducing its footprint to cut costs. About a fifth of its pre-pandemic workforce, about 18,000 employees, accepted buyouts and early retirement packages, reported NBC. This move prompted a $3.1 billion restructuring charge.

Many airlines received portions of $25 billion in federal payroll support from Congress.

The Transportation Security Administration screened almost 64 million people at U.S. airports in the third quarter, which was up 150 percent from the three months ended June 30 but still down from the 221 million people that were screened in the year-earlier period, reported NBC.

Since the pandemic began, Delta Air Lines has posted more than $11 billion in losses.