The airline says it's offering compensation to customers who were significantly affected by delays or cancelations. Customers experiencing a delay of more than three hours, or a canceled flight, could receive $200 in vouchers for future travel.
Delta also said in some cases, customers were provided with hotel rooms or other accommodations.
Other travel experts say this is not an area where Congress needs to step in.
"It's not a safety issue so Congress doesn't need to act there," said Rui Neiva, a policy analyst at the Eno Center for Transportation. "It's mostly a business issue and people will vote with their wallets if this keeps happening to an airline continuously."