United Airlines said Tuesday that it lost $1.63 billion in the second quarter as revenue plunged 87 percent, and it will operate at barely over one-third of capacity through September as the coronavirus throttles air travel.

The Chicago-based airline burned through $40 million a day from April through June but said it will trim losses to $25 million a day in the third quarter by slashing costs.

CEO Scott Kirby said United cut its cash-burn rate below its closest rivals by shrinking its schedule to meet lower demand and cutting costs across the company. In a statement, he said the moves “positioned United to both survive the COVID crisis and capitalize on consumer demand when it sustainably returns.”

Investors will have to wait for United to provide more details about the quarter and the future outlook on Wednesday, when executives hold a call with analysts and reporters.

United, which started the year with 96,000 employees, said 6,000 have volunteered to take severance packages and leave. Last week, the airline warned 36,000 employees that they could be furloughed in October, although executives said they expect the final job-loss number to be smaller.

The quarterly loss, which was worse than Wall Street expected, followed the plunge in air travel due to widespread travel restrictions and passengers’ fear of flying during the coronavirus pandemic.

Air travel in the U.S. plunged starting in March, hitting bottom in mid-April at just 5 percent of the year-ago traffic. A slow partial recovery stalled in recent weeks as reported cases of coronavirus surged in many states, particularly in the South and West, and Northeastern states imposed quarantines on visitors from much of the country.