"The White Zone is for loading and unloading only. If you got to load or unload go to the White Zone!"
From Zappa Wiki Jawaka
"The White Zone is for loading and unloading only. If you got to load or unload go to the White Zone!" is an announcement than can be heard at the Los Angeles Airport and other airports in the USA as well. It informs passengers and travellers that they can load or unload luggage in the white curb of the airport.
Zappa regularly traveled by plane and heard this monotonous announcement whenever he was waiting in the airport lobby for his plane to arrive. The mind numbing pointlessness of these non-stop repeated phrases inspired him to use the line a few times on the album Joe's Garage on the tracks The Central Scrutinizer, Joe's Garage, A Token Of My Extreme and He Used To Cut The Grass.