Limited Delta departures resume after massive system outage

A Delta ground stop has been lifted and limited departures are resuming following a power outage that impacted Delta computer systems and operations worldwide. Cancelations and delays continue.

Lines at the ticket counter at Sea-Tac Airport were building and there are arrival and departure delays.

As of 4:25 a.m. Monday, there were three red-eye flights that were significantly delayed and eight flights coming into Sea-Tac were late.

The airline said a power outage in Atlanta overnight, which began at about 11:30 p.m. Sunday, impacted computer systems and operations worldwide, resulting in flight delays.

Large-scale cancellations are expected Monday but flights en route are operating normally.

Delta averages about 5,400 flights a day.

The airline said those who plan to fly on Monday should check the status of their flights.

Updates are available here.

The company said travelers will be entitled to a refund if the flight is cancelled or significantly delayed. Travelers on some routes can also make a one-time change to the ticket free of charge.

Computer outages have caused major headaches for airlines and travelers before. Southwest Airlines was forced to cancel more than 2,000 flights across the U.S. last month after technology problems prevented many travelers from checking in or boarding flights.

The Associated Press contributed to this report.