United Airlines joined JetBlue and Delta in offering free, round-trip flights to health care workers.
Shares of both airlines plunged in after-hours trading Friday.
Delta expects second-quarter revenue to be down 90 percent.
Delta Airline's subsidiary is teaming up with Global Center for Medical Innovation to manufacture face shields to protect hospital workers during the COVID-19 pandemic.
Most U.S. airlines are temporarily waiving coronavirus-related change and cancellation fees but are not issuing cash refunds.
The stimulus package earmarks $25 billion in funds to assist U.S. airlines with payment of employee salaries and benefits.
To beef up its cash position during the coronavirus crisis, Delta has entered into a $2.6 billion secured credit facility and is drawing down $3 billion under its existing credit facilities.
A Senate bill would grant up to $50B in secured loans, but bars cash grants
Delta Air Lines said on Wednesday it was parking more than 600 jets, cutting corporate pay by as much as 50%, and scaling back its flying by more than 70%.
In the first two weeks of this month, the airline has had more than 1 million fewer customers than the same period last year, United said.
U.S. airports have been jam-packed with long lines and long waits due to coronavirus virus screenings.
The company is helping customers adjust their travel plans, even working with other airlines when necessary.
The airline plans to slash capacity by 40 percent.
The virus outbreak hit just as the industry was forecasting mostly solid growth in 2020. A key measure of airlines' revenue was expected to rise 4.1% globally, according to the IATA.
President Trump blocked travel from Europe to the U.S. for 30 days to limit the spread of the coronavirus pandemic.
Trump's move is bound to drastically escalate disruptions facing global airlines and travelers on some of the most heavily traveled routes.
Trip cancellations have spiked but there is optimism that travelers will postpone their trips.
Private jet companies have seen a surge in business as major airlines are hit with slowing sales and canceled flights amid coronavirus.
FAA's change will keep airlines from losing their slots at busy airports.
Delta and Southwest air lines are taking enhanced precaution when it comes to cleaning planes including Delta's new method called "fogging."