Portland International Airport’s flight tracker showed 17 canceled Alaska arrivals and seven canceled departures as of 6:30 a.m. Friday, as well as dozens of delayed flights. Alaska Airlines said it is working on getting travelers affected by the disruption to their destinations.

Alaska Airlines has resumed operations after an information technology problem forced hundreds of its flights to be grounded Thursday night.

The airline said in a statement that it was "experiencing an IT outage affecting operations" and had "issued a temporary ground stop."

Alaska Airlines resumed operations after issuing a nationwide ground stop for eight hours following a "significant IT outage," the airline said.

Alaska Airlines said late on Oct. 23 that it was restoring operations after grounding flights for about three hours due to an unspecified technology outage. "We are actively restoring our operations following an IT outage," the airline said on social media.

The Trump administration has finalized a plan to open the coastal plain of Alaska's Arctic National Wildlife Refuge to oil and gas drilling, renewing long-simmering debate over whether to drill in one of the nation's most sensitive wilderness areas.

With millions of annual passengers, disruption on this scale has significant ripple effects across national air travel.

"Alaska Airlines is experiencing an IT outage affecting operations. A temporary ground stop is in place. We apologize for the inconvenience," Alaska Airlines said in a statement issued on social media.

Hawaiian Airlines, which was bought by Alaska Air Group last year, said its flights were operating as scheduled. In July, Alaska grounded all of its flights for about three hours after the failure of a critical piece of hardware at a data center.

President Donald Trump has approved major disaster declarations for Alaska, Nebraska, North Dakota and the Leech Lake Band of Ojibwe