Southwest Technical Issues Delay 450 Flights

Southwest (LUV) warned customers Sunday that "technical issues" are requiring the airline to check-in customers manually, causing longer wait times. The problems persisted throughout the day Sunday, resulting in 450 delays as of 2:30 p.m. ET.

"We're continuing to experience intermittent technical issues on Southwest.com platforms, the Southwest Mobile app, and in our phone centers, as well as in airports across our system today," the company said in a statement.

Southwest warned fliers to arrive "at least two hours early" and advised customers to use kiosks to print boarding passes and bag tags.

The airline has 3,600 scheduled throughout the day. Customers are encouraged to use swamedia.com for updates.

Southwest's technical difficulties come just three months after a glitch at United Airlines grounded 4,900 scheduled flights.