Southwest Airlines passengers at Los Angeles International Airport, and nationwide, were experiencing delays Wednesday due to technical issues plaguing several systems.
The issues led to the delay or cancellation of 600 to 700 flights, the airline said in a statement.
Southwest began experiencing "intermittent performance issues earlier this afternoon with multiple technology systems as a result of an outage," the statement explained.
The Dallas-based airline said it reduced the number of flights departing Wednesday evening so that it could "fully restore" the system for Thursday flights. The airline previously said it was using manual systems until others were fully operational, the statement said.
Customers would be able to rebook their flights once the affected systems were "fully functional," the airline added.
"We apologize to our Customers whose travel plans are impacted," the statement said. "We have a Team of experts working diligently to resolve the technical issues and their efforts have systems gradually coming back online. We expect to continue our move toward a normal operation but believe it will take time."
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9:20 p.m.: This article was updated with additional details.