In the summer of 1900, a zeppelin stayed aloft for a full eighteen minutes above Lake Constance and mankind found itself at the edge of a new world. Where many saw hope and the dawn of another era, one man saw a legal conundrum. Charles C. Moore, an obscure New York lawyer, began an inquiry that Stuart Banner returns to over a century later: in the age of airplanes, who can lay claim to the heavens? The debate that ensued in the early twentieth century among lawyers, aviators, and the general public acknowledged the crucial challenge new technologies posed to traditional concepts of property. It hinged on the resolution of a host of broader legal issues being vigorously debated that pertained to the fine line between private and public property. To what extent did the Constitution allow the property rights of the nationαs landowners to be abridged? Where did the common law of property originate and how applicable was it to new technologies? Where in the skies could the boundaries between the power of the federal government and the authority of the states be traced?

A momentous problem -- An aerial territory -- The peculiar beauties of the common law -- A uniform law -- Interstate commerce in the air -- Landowners against the aviation industry -- The rise and fall of air law -- William Douglas has the last word -- Sovereignty in space -- Technological change and legal change.