The headaches for Southwest, which is widely credited for pioneering the low-fare airline business model, began on Monday night, when a problem with a weather data supplier prevented the airline from safely flying planes. The issue was resolved within hours, but on Tuesday the airline suffered its own technological problems, resulting in half of its flights that day being delayed and many being canceled, according to FlightAware, a flight tracking service.
Spillover from that episode caused Wednesday’s problems, the airline said. About 10 percent of Southwest’s flights were canceled and another 19 percent were delayed by midafternoon, according to FlightAware.
“While our technology issues from Tuesday have been resolved, we are still experiencing a small number of cancellations and delays across our network as we continue working to resume normal operations,” Dan Landson, a Southwest spokesman, said in a statement.