A quiet day on Wall Street turned into a major win for airline investors Thursday, as Delta Air Lines Inc. DAL surged 12% after posting second-quarter results that topped both earnings and revenue expectations, while indicating a strong demand outlook, sparking a broad rally across the sector.Shares of American Airlines Group Inc. AAL jumped 12.5% and United Airlines Holdings Inc. UAL rallied 13.5%. The U.S. Global Jets ETF JETS, which tracks airline stocks, soared 7.2% for its best day since the 90-day tar ...