Airlines are canceling hundreds of flights to comply with the FAA's order. But there are still questions about the plan, which the agency says will keep the skies safe during the government shutdown.

Transportation Secretary Sean Duffy warned as many as 20% of flights could be canceled if the government shutdown drags on.

Travelers at the Newark and Atlanta airports are facing soaring delays and cancellations amid the government shutdown.

Colorado lawmakers are pushing for the Federal Aviation Administration to approve Denver International Airport's emergency waiver that would allow air traffic controllers to be paid during the shutdown.

The U.S. Federal Aviation Administration (FAA) on Saturday issued an order prohibiting MD-11 planes from flying, pending inspection, after a fiery crash of a UPS cargo freighter that killed at least 14 people in Louisville,

The refund policy for Delta’s cancelled flights does allow reimbursement but not for all expenses. Delta Air Lines is experiencing daily flight cancellations like many U.S. carriers. That’s, in part, due to the Federal Aviation Administration mandating flight reductions as the government shutdown continues.

The government shutdown has triggered 1,000-plus flight delays as the FAA cuts capacity at 40 airports. Airlines are offering refunds and policy changes amid ongoing travel disruptions.

Passengers on flights canceled due to the FAA order are entitled to a refund from the airline. While Knoxville's airport is not on the reduction list, travelers to and from 40 major hubs could be affected.