Business travel at Delta Air Lines is surging, exceeding expectations with “mid-teens” growth, according to a Thursday (July 11) Q2 earnings transcript.Delta President Glen Hauenstein said during the call that Delta benefited from double-digit volume growth in this high-value segment with broad demand and growth across all sectors. He noted that the company’s premium tier continued to perform (10% year-over-year increase) admirably and helped differentiate the airline’s results.“We have runway ahead as we c ...