Morten Broberg, from the University of Copenhagen, familiarizes the audience with the Denied Boarding Regulation and discusses whether it provides an adequate legal basis for dealing with exceptional situations like the one experienced during the 2010 ash cloud. 1st HEC workshop on regulation. Emergency regulation under the thread of a catastrophe: a hard look at the volcanic ash crisis. A conference organised by Alberto Alemanno, HEC Paris. 10 & 11 november 2010. More info at http://www.albertoalemanno.eu