America’s major domestic air carrier stocks have tumbled this week as the airlines cut capacity, ax routes, trim financial outlooks and slash executive pay amid bottoming demand from the coronavirus.

The tourism industry has been among the hardest hit by the coronavirus. In a matter of weeks, hotels, airlines and convention centers have seen their bookings plummet as leisure travelers stay home and businesses discourage or cancel employee travel. And the latest updates from Delta, American and United airlines signal that their outlook for the coming months is equally bleak: as travelers cancel vacations, businesses discourage employees from leaving town, and conventions are canceled en mass, industry executives are comparing the outbreak’s fear factor to the aftermath of the Sept. 11, 2001, terrorist attacks.

Delta’s stock was down more than 13.5 percent in early trading. The Atlanta-based carrier cutting international flights by as much as 25 percent and domestic routes as much as 15 percent. The carrier also is withdrawing its 2020 financial outlook, instituting a hiring freeze and suspending its stock repurchase program.

American Airlines was down nearly 15.7 percent in early trading. The Fort Worth-based carrier is less vulnerable to declines in international business, but will scale back peak summer international flying by 10 percent, including a 55 percent reduction in trans-Pacific routes as the outbreak continues to exact a toll on China, South Korea and Japan. American will also reduce domestic flying in April by 7.5 percent.

United Airlines, which has seen a 70 percent plunge in domestic net bookings, was down nearly 16.5 percent in early trading. The Chicago-based carrier said Tuesday that its CEO and president will forgo their base salaries through at least the end of June, and that it plans to cut 20 percent of flights indefinitely until it sees demand pick up.