DALLAS (AP) — American Airlines is notifying about 25,000 workers that their jobs could be eliminated in October because of plunging demand for air travel, adding to the toll that the virus pandemic is taking on the airline industry.

American’s top executives said Wednesday that the number of layoffs or furloughs could be lower if enough workers take buyouts or accept partially paid leave for up to two years.

Airline officials thought they might avoid furloughs “because we believed demand for air travel would steadily rebound by Oct. 1 as the impact of COVID-19 dissipated. That unfortunately has not been the case,” CEO Doug Parker and President Robert Isom said in a memo to employees.

Air travel has picked up slowly since mid-April, but remains severely depressed. American’s passenger revenue in June was down more than 80% from the same month last year.

U.S. airlines accepted up to $25 billion in federal aid to help cover payroll costs in exchange for not cutting jobs until October. American received $5.8 billion in cash and loans, Delta got $5.4 billion and United Airlines received $5 billion. The aid likely only delayed massive job cuts throughout the airline industry.

Last week, United told 36,000 employees that they could lose their jobs in October. Delta has sent notices to more than 2,000 pilots.

Separately, Delta Air Lines said Wednesday that it expects to take a charge of $2.7 billion to $3.3 billion to cover the cost of early retirements and buyouts for employees as it shrinks in response to a sharp decline in air travel.

The airline said this week that 17,000 employees have agreed to depart.

Delta said in a regulatory filing that $500 million to $600 million of the charge would go toward cash payments to pilots, flight attendants, ground workers and other departing employees in the July-September quarter.