Bangor International Airport. Credit: Linda Coan O'Kresik

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Bangor International Airport flight schedules remain unaffected by the presence of Coronavirus in Maine, airport director Tony Caruso said Friday. But many travelers flying out of the airport can change their tickets without incurring a fee.

Allegiant Airlines, American Airlines, Delta Airlines and United Airlines, the four domestic carriers that service the airport, have all instituted policies that allow passengers to change their flights free-of-charge, with certain conditions.

Passengers flying with Allegiant Airlines can request “a one-time change to their travel plans without incurring change / cancel fees,” according to the company’s website

[Here’s what has been canceled or postponed in Maine due to coronavirus]

American Airlines customers can change flights for free if they purchased tickets before March 1 for travel planned through April 20, the company said on its website.

Delta Airlines is waiving its change fee for customers who have traveled scheduled for March or April.

United Airlines passengers who booked flights between March 3 and March 31 can change their flights without incurring a fee for the next 12 months. The airline is also waiving change fees for all flights with travel dates between March 9 and April 30.

At midnight on Friday, the Trump administration will ban non-U.S. citizens traveling from 26 European countries from entering the country. On Thursday, President Donald Trump said that restrictions on domestic flights were a “possibility” if the virus becomes “too hot.”

Bangor International Airport does not have regularly scheduled international flights. But the airport does sporadically provide services as a “technical stop” for flights arriving from overseas, said Caruso. These technical stops can occur if flights are rerouted, or require fuel services, he said.

[Interactive map: The number of confirmed coronavirus cases in each state]

Bangor International Airport has doubled the frequency of its cleaning regimen, Caruso said. Staff have also put hand sanitizer stations throughout the airport. As for the planes themselves, individual carriers are responsible for their cleaning. For example, Delta has doubled its usual cleaning program and has added a “fogging process” to disinfect incoming trans-oceanic flights.

Caruso said he believed the airport saw fewer travelers over the past week. But the effects of the Coronavirus pandemic were mostly “anecdotal at this point,” Caruso said.

Watch: Symptoms of the coronavirus disease