We're not going out there. Delta does this all the time: schedules one DCI carrier tentatively to hold a schedule then later changes it. It will switch to SkyWest before that flight launches, or possibly Compass since they are doing a lot of SEA flying. Just because it says CR9 now doesn't mean they won't change it to E175 later.

They didn't finalize the last DC9 rotation until two months prior, and they swapped equipment from MD88 to DC9.