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.

Several airlines are offering the option to rebook or issue a refund for customers whose flights are impacted by the reductions.

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 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.