Bethesda, Md. — Robert L. Johnson, founder and chairman of the RLJ Companies and founder of Black Entertainment Television (BET), has announced a joint venture with the Boston-based restaurant group Legal Sea Foods to open smaller-scale versions of the famed restaurant within airports across the country. “I am very excited about the RLJ Companies joining with Legal Sea Foods and its CEO and president, Roger S. Berkowitz, to expand the Legal Sea Foods dining experience to millions more airport travelers,” Johnson says. “Berkowitz’s family founded Legal Sea Foods, whose roots …