This, too, was one of my favorite color episodes of TAGS. I think it's because of my love for flying and small engine aircraft.
After watching this episode for 35 years, I wanted to know where this place was.
After some research, I found that the smoke stacks in the background are located at:
9430 San Fernando Rd, Sun Valley, CA 34°14'20.63"N, 118°23'36.60"W
The airport is right down the street at Whiteman Airport 34°15'29.09"N, 118°24'44.98"W
Use these coordinates in Google Earth and you will feel like you're in 1968 and ready to fly with Aunt Bee!