On March 24, Delta Air Lines joined the other major U.S. carriers in cutting back on some of its scheduled routes. It announced it will cut 12 percent of its flights, starting March 27 for U.S. flights and April 6 for flights to Europe. Depending on demand, the flights may be reinstated in May. The airline also has indefinitely postponed a seasonal service between Boston and Rome, and a daily service between Cincinnati and Rome, both of which were scheduled to start May 1. No layoffs had been announced.

Here’s what the other airlines have announced as of March 25:

American Airlines has reduced its international flights by 6 percent.

Continental plans to cut 1,200 jobs.

Northwest has reduced its flight schedule by 12 percent, and plans to lay off 4,900 employees.

United has reduced its flight schedule by 8 percent.

International carriers also are dropping flights. Korean Air Lines cut flights to Dubai and Cairo, and Singapore Airlines plans to cut 8 percent of its capacity later this month, including services to Las Vegas and Chicago for the next two months. Air Canada has announced it is eliminating 3,600 positions.

According to the International Air Transport Association, international travel to some regions could drop as much as 20 percent over the course of the war, which could result in further route and job cuts.