A computer outage that disrupted United Airlines flight departures Friday night and left passengers stranded overnight has been fixed, the airline said Saturday morning.

The airline blamed the problem on “a network connectivity issue” and said it was in the process of resuming normal operations, the Associated Press reported Saturday. The airline, however, also indicated that passengers may experience some delays for the rest of the weekend.

“While we will be experiencing some residual effect on our flight operations throughout the weekend, United is committed to restoring normal operations as soon as possible,” the AP quoted Alexandria Marren, senior vice president of system operations control for United, as saying in a written statement. “We encourage customers to print their boarding pass prior to arrival at the airport and give themselves extra time.The airline apologized to its customers and said it was rebooking passengers as needed.

The outage began about 8:15 p.m., and lasted about five hours, causing long lines to forn in airports in Chicago, Los Angeles, Denver and San Francisco.

Not that long ago, US Airways had computer problems caused by a power outage.

Some passengers reported being stuck at Dulles International Airport on Friday night.

Here are some tweets from United and from passengers while the computer outage lasted: