CHICAGO — A group of airlines on Tuesday asked the U.S. Transportation Department for approval to suspend flights to more than two dozen U.S. airports, including Chicago’s O’Hare International Airport.

The request comes as the number of new coronavirus cases in the United States topped 1 million Tuesday and air travel demand has decreased by more than 95 percent, according to a report by Reuters.

Delta, JetBlue Airways and Spirit Airlines have requested to suspend flights to various cities. The companies are following United and Frontier Airlines, whose requests to suspend flights were mostly denied by the Department of Transportation earlier this week.

JetBlue is also the first major airline to require passengers to wear face coverings. Most airlines already required flight attendants to wear masks.