Delta shares tumble after outlook falls short of estimates despite strong summer travel demand CNBCDelta’s Sagging Profit Signals Trouble for Airlines This Summer The Wall Street JournalDelta Q2 earnings miss expectations despite ‘healthy’ travel demand Yahoo FinanceDelta’s Outlook Misses Estimates as Carriers Slash Summer Fares BloombergDelta’s stock dives after a profit miss, and a downbeat revenue outlook for the current quarter MarketWatch