Thank you Rock 41 and 42
KC-135 near Seattle. Refueling Rock 41/42?
https://global.adsbexchange.com/VirtualRadar/desktop.html#
This is what F-15's look like.
Aircraft Spots
@AircraftSpots
18m18 minutes ago
USAF KC-135R 63-8021 GASMN04 scrambled from Fairchild at 0425z to support F15's ROCK41 & ROCK42 currently over Seattle
https://twitter.com/AircraftSpots/status/1028147247689564160