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UPDATE: United Airlines lifts ground stop; IT problem resolved

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UPDATE:  United Airlines lifted a ground stop on all domestic mainline flights Sunday night after an issue with one of its key communication systems was resolved, two sources familiar with the incident told CNN.

Flights were stopped for about an hour, until the computer problem was remedied.

(CNN)– United Airlines grounded all domestic mainline flights Sunday night because of a computer problem, United spokeswoman Maddie King told CNN.

“We have issued a ground stop for all domestic mainline flights due to an IT issue,” King said. “We are working as quickly as possible to resolve this issue and get our customers to their final destinations. We apologize for the inconvenience to our customers.”

Mainline flights are those operated by an airline’s main operating unit, not regional alliances or subsidiaries.

Other computer glitches have hit airlines.

In October, United flights were delayed for hours because of a computer problem, causing a social media firestorm.

United said it experienced an issue with its weight reporting system that was later resolved.

In September, British Airways suffered a computer problem that caused delays and long lines at airports in the United States and Europe.

In August, Delta was forced to cancel around 2,000 flights after a major system failure. That came only a few weeks after an outage caused more than 1,000 cancellations at Southwest Airlines.