 The airport is located outside the Seattle-Tacoma International Airport Class B airspace but is underneath the 30-nm veil that requires an altitude encoding transponder for aircraft equipped with an electrical system.A 2001 study by the Washington State Department of Transportation's Aviation Division credited Harvey Field for providing nearly 450 jobs, more than $7.5 million in annual payrolls and an economic impact on the local community of more than $22.2 million each year.As stated above, the airfield also provides a base for tourism.