They are online : Seattle Airports X and Seattle City X at simMarket !
In the airports package, you will find detailed sceneries of Paine Field KPAE featuring Boeing Event Factory, Boeing Field KBFI with multiple static aircraft of high interest, Renton Municipal Airport KRNT with a marvellous landscape, and Auburn Municipal Airport S50 with a unique ambience. Seattle Tacoma KSEA will be an optional update v1.1 charged 10 EUR. When v1.1 release, the whole pack price will raise and will include KSEA by default.
Seattle City X has a wide area covered with summer, winter and night and populated of thoushands of custom buildings, with custom traffic, seaplanes bases, trains, ships..