Southwest Airlines is warning customers they may face long lines at McCarran International Airport Thursday.
Technical issues led the largest carrier at McCarran to cancel nearly 700 flights Wednesday across the country and “hundreds more” were delayed — tracking service FlightStats Inc. put the delays at nearly 2,100.
The airline said “most systems are back online” after problems that began with an outage Wednesday afternoon and continued intermittently well into the night.
The airline said that it was trying to accommodate stranded passengers on new flights. Because of that, it expected long lines and told passengers to arrive early for Thursday flights.
Southwest officials said they had not identified the cause of the outage. Several of the airline’s technology systems were affected for several hours. The airline briefly held up all departing flights on Wednesday, and its website and electronic check-in systems failed.