The company estimated that 250 flights had been affected by a shutdown in the computer software used to dispatch flights.
The system shutdown began about 10 p.m. CT. The airline’s entire fleet of planes was grounded. The glitch did not affect flights that were already in the air but it did impair the airline’s ability to do such things as conduct check-ins, print boarding passes and monitor the weight of each aircraft.
By 2 a.m. , Southwest posted on its Twitter page that “systems are operating and we will begin work to get customers where they need to be. Thanks for your patience tonight.”