Customers of Delta Air Lines were forced to cope with delays and cancellations for the third straight day Wednesday as the air carrier struggled to rebound from a power failure that led to the grounding of over 1,000 flights Monday and almost 800 flights Tuesday.

Konstance Woods talks on her cell phone with an agent as she stands in line at the Delta ticketing counter at Washington's Ronald Reagan Washington National Airport, Monday, Aug. 8, 2016. Delta Air Lines delayed or canceled hundreds of flights Monday after its computer systems crashed, stranding thousands of people on a busy travel day.

Southwest Airlines Co forecast on Wednesday a further drop in a key profitability metric for the quarter due to delays and cancellations of more than 2,000 flights after an outage hit its computer systems in July.

Delta is predicting 90 flights to be canceled Wednesday, although tracking service FlightStats indicates there are about 150, the Associated Press reported.

"What a nightmare", said American Jeff Quigley, who managed two hours of sleep at the airport after his Monday afternoon flight to Manila was delayed until the next morning.

For passengers flying from European Union countries to the United States whose flights were delayed for more than 4 hours or canceled, the EU requires that the airline provide 600 euros, or about $660, and get passengers back home. "I'm sorry we let you down". That's on top of 850 flights canceled on Tuesday and 1,000 canceled flights Monday.

Delta extended a travel-waiver policy to help stranded passengers rearrange their travel plans. The outage has snarled Delta's flights ever since.

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"Following the power loss, some critical systems and network equipment didn't switch over to Delta's backup systems". He also offered refunds and travel vouchers to United States $ 200 for travelers whose flights have been canceled or delayed for at least three hours.

However, a spokesman for Georgia Power said that the company believes a failure of Delta equipment caused the airline's power outage. Where available, customers are being provided hotel rooms and other accommodations if a cancellation requires an overnight stay.

Gil West, Delta's chief operating officer, said some systems remained unstable, causing slowness in checking-in and boarding customers and dispatching planes. "As they've grown in importance and stature with more flights and customers, taking time to do maintenance becomes a bigger issue".

"We are doing everything we can to return our operation to normal reliability, but we do expect additional delays and cancellations", Holtz said.

Delta won't charge its ticket change fee, which can cost as much as $500, even if your flight was not canceled.

Delta operates 5,000 departures a day and is a member of the SkyTeam alliance alongside airlines including Air France-KLM.