Centennial Airport is open 24 hours a day. We do have aircraft activity at night, mostly flights carrying light cargo or checks for the Federal Reserve. These overnight flights are a critical piece of the economy. In addition, interstate commerce laws require that the airport remain open 24/7. A large portion of our overnight flights will consist of air-ambulance flights transporting patients, blood, or organs to points throughout the state and country. The largest air-ambulance companies in Denver provide air-ambulance service to the entire region through Centennial Airport. Law enforcement and news media also use the airport regularly at night.