Casino operator Las Vegas Sands Corp is exploring a sale of its flagship casinos in Las Vegas for about $6 billion, a source told Reuters on Monday, with the move likely to mark the exit of the group’s chairman from the U.S. gambling industry for now. The properties included in the potential sale are Sands Expo Convention Center, the Venetian Resort Las Vegas and the Palazzo, the source added, asking not to be identified. A potential sale of the Las Vegas properties will concentrate the company’s casino portfolio entirely in Macau and Singapore. Bloomberg reported earlier that Las Vegas Sands…