Boeing Field, officially King County International Airport (KBFI), is a two-runway airport owned and run by King County, Washington,
USA. The airport is located just a few miles south of Downtown Seattle and can be scene from Interstate I-5. The airport has a few FBOs, some scheduled Kenmore Air commercial flights to areas around the Puget Sound, both fixed wing and helicopter flight schools based on the east side of the airport. On the north end Airlift Northwest runs its helicopter Medevac and jet air ambulance services. On the south side King County Sherrifs Office keeps its fleet of PD and SAR helicopters. The west side of the airport features the Museum of Flight, General Aviation tie-downs and hangars, FAA Control Tower, and the name sake to the airport, the Boeing Company.
All though Boeing doesn't build aircraft at this airport (737 come from Renton; 767,777,787,747 are built in Everett) there still are plenty of aircraft going through flight testing and final inspections prior to client fly-away and delivery.
North Park Viewing Spot:
Ruby Chow Park
13th Ave S and S Hardy St
Seattle, WA 98108
From I-5 south take Exit 161 Alboro Place, keep right and turn onto S. Alboro Place. Get into left lane. At the second traffic light, 13 Ave South, turn left. The park and grassy area will be on your left.
Images from Ruby Chow Park
Images from Mid Field Air Park
Museum of Fligh:
Located in the south west corner of the airport, the Museum of Flight gives you close action to aircraft landing on Runway 31L in a north arrival. Departures will be breaking through 800ft at this time. The parking lot is part of the mueum's private property. Standing on your vehicles roof or on tall ladders might make them to ask you to leave.
Images from The Museum of Flight