In the middle of the
news release for new lounges and routes for Seattle:
eligible passengers flying in any cabin who check in via the Fly Delta app and enroll in TSA PreCheck Touchless ID (formerly Delta Digital ID) can access expedited bag drop and security lanes, with this benefit rolling out to all Delta hubs by year's end.
Touchless ID will be available in SEA starting on June 25, which isn't surprising since
Alaska (SEA's largest carrier) first announced they will support it on June 26.
Having used it a couple times in DTW and ATL, it's been amazing fast with no wait, at least for now until more people enroll.