Just curious: what airport did you use to film this episode? Was it permanently closed, or closed just for filming?

I believe the airport is Agua Dulce airport in Southern California. There was some talk of shutting it down (damned realtors!), but as far as i know its still open. Real nice destination for a weekend flight and lunch. Hopefully the owner got a nice check for letting those guys spew bus parts and dirt all over the place.