Delta Air Lines said Sunday that the company is still working to "stabilize" operations, several days after powerful thunderstorms blew through the eastern portion of the U.S.
The airline's website said Sunday that 150 flights were canceled Sunday, adding that more are "possible."
By Sunday night, 1,152 Delta flights were delayed, according to the flight-tracking service FlightAware.
"Delta operations are continuing to normalize, though availability of flight crews to operate within federally mandated crew rest and duty day guidelines following last week’s disruption have prompted some additional cancellations and delays," a statement on the airline's website said.
Delta apologized to its customers on Twitter, saying the company is working hard to rebook everyone as soon as possible.
We apologize to our customers that have been affected by storms this week. We're working hard to rebook everyone as soon as possible. (1/3)— Delta (@Delta) April 7, 2017
You are entitled to a refund if your flight has been cancelled. Waivers to change fees that were issued Thursday remain in place. (2/3)— Delta (@Delta) April 7, 2017
Wednesday's severe storms in Atlanta, which is one of the company's busiest hubs, caused flight disruptions that eventually trickled down to affect other hubs in the network, CBS reports.
“We are grateful for your patience and want you to know that we, as always, learn from these experiences," Delta’s Chief Operating Officer Gil West said in a statement Thursday. "While we can’t control the weather, we understand the resulting recovery has not been ideal and we apologize for that.”
Delta notes on its website that if a customer's flight is canceled or delayed by 90 minutes or more, he or she is entitled to request a refund. The company is also offering to waive change fees for those who wish to rebook on another flight.