US airlines are providing more time for the customers to change their flights to China without incurring fees as the coronavirus continues to spread, and as American authorities raise travel precautions for the country.

On Monday both American Airlines (AAL) and Delta Air Lines (DAL) have extended change fee sacrifices through the end of February. Previously, they had issued abandonments through the end of January.

That means travelers who schedule to fly on airlines to Beijing or Shanghai cities, can change to a different flight without paying a fee to do so.

United Airlines (UAL) also extended waivers for change fees on flights to Chengdu, Beijing or Shanghai until the end of February. Initially, it offered waivers up to February 7.

United is also offering refunds to passengers traveling to Wuhan if they bought their tickets by January 21 and are expected to travel there from now until March 29.

On Monday, the US Centers for Disease Control and Prevention raised its travel precautions for China to its highest level. That means it is advising travelers to “avoid non-essential travel” to the country. Only Hubei province carried such a warning previously.

As Coronavirus has continued to spread, more than 100 people are dead and more than 4500 people are affected in China, according to health officials in the country. And dozens of others have been infected worldwide.

Now, the CDC has announced, it is monitoring for coronavirus symptoms among passengers arriving at 20 US airports. The agency has also announced an enhanced screening of passengers from Wuhan at 5 airports.

A health official with the CDC said the agency had screened around 2,400 people so far, on Monday. Travelers can stay connected with our page for the Latest World News.