Delta Air Lines, American Airlines and United Airlines said on Friday morning that they were suspending service between the United States and China — drastically limiting service just hours before the Trump administration issued new travel restrictions of its own.

American Airlines said it was suspending all flights to and from mainland China immediately through March 27. Delta and United said they would suspend service starting on Feb. 6 to accommodate customers and employees. United said it expected to resume operations on March 28. Delta said its suspension would last through April 30.

American Airlines and United said they would still operate flights between the United States and Hong Kong. Delta does not fly to that city.

Share prices in all three airlines were down for the day — nearly 4 percent for United, more than 3 percent for American and nearly 2.5 percent for Delta — as concerns about the virus led to a broad market decline. The S&P 500 was down nearly 2 percent.