C.R.S. § 41-1-104: License for navigation.

The public safety requiring and the advantages of uniform regulations making it desirable in the interest of aeronautical progress that a person engaging within this state in navigating aircraft designated in section 41-1-103 in any form of navigation for which license to operate such aircraft would be required by the United States government shall have the qualifications necessary for obtaining and holding the class of license required by the United States government. It is unlawful for any person to engage in operating such aircraft within this state in any form of navigation unless he has such a license.