Delta Close the Door: U.S. carriers, together with their unions, are playing the protectionist card Share WhatsApp LinkedIn X Facebook Email Delta Close the Door: U.S. carriers, together with their unions, are playing the protectionist card January 2014 3 min read Seth Kaplan Subscribe Purchase ($55 USD) Already a subscriber? Login Issue Overview Keep the doors closed, Air Canada’s chief Calin Rovinescu implied during a recent speech in Vancouver.