Since 1973, supersonic flight over land has been illegal in the US. In those days, supersonic planes were loud, gas-guzzling, and inefficient beasts, propped up by government subsidies. Today, however, new technologies have made supersonic flights quieter, more efficient, and more affordable. Is it time to lift the ban? How should supersonic flight be regulated? What role will NIMBYism play in the debate? Eli Dourado, Research Fellow at the Mercatus Center, joins the show. For more, see his report here.