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The numbers seen on FlightAware, the website that tracks the status of flights and when they’re leaving and arriving at airports, appears to be backing up Cooper’s assertion as 218 flights at Sea-Tac Airport have been delayed and seven have been canceled as of 5:15 p.m. Monday.
On Sunday, 503 flights were delayed at Sea-Tac Airport and five flights were canceled, according to FlightAware reported. The number of delays had risen steadily through the day with a spike in the afternoon and another one at night as there were 375 delays reported at 8 p.m., 322 delays reported at around 5 p.m., 144 delays at noon, 73 delays at 9 a.m. and 23 delays at 5:10 a.m.
On Saturday, 342 flights were delayed at Sea-Tac Airport and six flights were canceled. That number rose steadily through the night. More were delayed leaving the airport (197) than arriving (145).

How we got here: ‘Possible cyberattack’ hits Sea-Tac Airport
Cooper said investigators are still trying to determine the nature of the cyber attack, he said airport personnel noticed “nefarious characters” in the system early Saturday and administrators decided to shut the whole system down.
Just after 9 a.m. Saturday is when the Port of Seattle and the airport began publicly alerting the problem to potential issues. That is the time the Port of Seattle first detailed the issues in a post on X. A post on @flySEA at that time encouraged passengers to check with their airlines for the latest for their flights as well.
The initial communication from the Port of Seattle and Sea-Tac Airport did not indicate the internet outage may have come from any sort of cyber attack. However, just before 1:30 p.m. Saturday, the Sea-Tac Airport X account published another X post stating the port “experienced certain system outages indicating a possible cyberattack.” Sea-Tac Airport also previously wrote on X it is “working closely with appropriate authorities and partners to help travelers who may be impacted.”

Recommendations for travelers going to Sea-Tac Airport
Sea-Tac Airport has been active about providing various recommendations to those who are traveling while this outage is happening. KIRO Newsradio and MyNorthwest have compiled the following tips:

Customers should use the app for the airline they are flying instead of the airport app. For passengers who don’t need to check a bag, don’t do it. International travelers should arrive early for checking in and checking their bag. Reminder for passengers: The standard TSA rules apply, including the 3-1-1 Liquids Rule. Travelers can get assistance on @flySEA social media and on this Customer Care Connect website.

https://mynorthwest.com/3981197/no-estimated-point-return-cyberattack-continues-plague-sea-tac-airport/