WBEZ brings you fact-based news and information. Sign up for our newsletters to stay up to date on the stories that matter.The European Union’s “Single European Sky” proposal aims to divide up the region’s air traffic into regional blocks. Earlier this month French air traffic controllers went on strike to protest the plan. David McMillan, chairman of the board of the Flight Safety Foundation and former director general of Eurocontrol, joins us to explain what’s at stake. (Photo: AP Images).