Hartsfield–Jackson Atlanta International Airport now the airport's second largest carrier. In May 2001 construction of an over fifth runway (10–28) began. It was completed at a cost of $1.28 billion and opened on May 27, 2006. It bridges Interstate 285 (the Perimeter) on the airport's south side, making Hartsfield–Jackson the nation's only civil airport to have a runway above an interstate (although Runway 17R/35L at Stapleton International Airport in Denver, Colorado crossed Interstate 70 until that airport closed in 1995). The massive project, which involved putting fill dirt eleven stories high in some places, destroyed some surrounding neighborhoods and dramatically changed the scenery of
San Diego International Airport Diego International Airport entered the blogosphere with the launch of the first employee blog–the Ambassablog–for a major US airport. Written by front-line employees, the blog features regular posts on airport activities, events, and initiatives; reader comments; and several multimedia and interactive features. It has been presented as a case study in employee blogging to several public agencies at the federal, state, and local levels. In February 2008, San Diego International Airport was one of the first major airports in the US to adopt a formal sustainability policy, which expresses the airport's commitment to a four-layer approach to sustainability known as