Southwest Airlines says technology issues have delayed some flights as airline employees have to process travelers manually as they arrive at airports.
At Los Angeles International Airport, several dozen people crowded the Southwest terminal, waiting to be issued hand-written tickets. The company said that as of noon Sunday, approximately 250 of the 3,600 flights set to operate on Sunday had been affected by short delays.
In a statement on its website, the Dallas-based airline said it's working on the technology issues and airport-based employees are helping customers with their individual itineraries. Southwest is also asking customers to arrive at least two hours before their scheduled departures.
"We're experiencing technology issues on southwest.com, the Southwest Mobile app, and in reservations centers and airports across our system today, which are impacting future bookings and are requiring us to process Customers manually as they arrive for travel," Southwest said.
"While teams work diligently to enhance the performance of our technology, our airport-based Employees are working with customers on their individual itineraries and we apologize for the extra effort and delayed arrival of passengers and their baggage," it added.
--CNBC.com contributed to this article.