The Transportation Department said ongoing flight disruptions and reports of customer service issues prompted it to investigate Delta as the carrier’s meltdown enters its fifth day.
Since Friday's outage, Delta has struggled to bounce back. CEO Ed Bastian said an issue with Delta's crew scheduling tool caused the continued flight disruptions.
Negotiations between American and its flight attendants became so tense that their union told members to be prepared to strike this summer. The tentative deal now makes it unlikely that flight attendants could stage a summer strike.
An IT outage early Friday morning sent the world reeling as it affected banks, healthcare and airlines. The airline industry is currently experiencing thousands of disruptions, and it could take days for carriers to bounce back.
United Airlines had a strong second quarter, benefitting from high demand for international travel, a resurgence in corporate travel and increases in revenues for their basic economy and premium products.