It was a show of regional co-operation that many companies had never seen, and Denver’s business community soon began checking off big-ticket items on its list. The Colorado Convention Center opened in downtown Denver in 1990, the Colorado Rockies came to town in 1993 and planes began flying out of Denver International Airport, the only international airport to be built south of the border in the last 25 years, in 1995. (The legacy of this effort is the Metro Denver Economic Development Corp., which claims to be the “first regional economic development entity” in the U.S.)