Denver International Airport (DIA) aims to become a world-class airport by emphasizing service, on-time flights, and caring for the environment. Addressing environmental issues may be a new approach for an airport, but it has paid off for DIA. In 2005, it became the first international airport in the United States to be ISO 14001 (environmental management system, or EMS) registered. DIA did not set out to become certified; it simply wanted a structure to handle environmental issues. ISO 14001 provided guidelines for establishing an EMS. With the amount of effort put into complying with the standards, the next logical step was to become certified. 1 There are more benefits to ISO 14001 certification than the credibility and additional transparency DIA has received. DIA has a structured EMS program that allows it to do more with less. Processes are documented outlining employees' duties. The employees receive training and understand what is expected of them from an EMS compliance standpoint. DIA has been able to influence the environmental actions of others. Impressed by DIA's accomplishments, the city and county of Denver have established environmental programs for all their departments. DIA is working with other international airports to establish sustainability guidelines for the world's airports. DIA's environmental initiatives have achieved quantitative and monetary results. The goals and results are highlighted in DIA's annual reports. Following is a list of some