I would like to correct Valerie Arkin's claim that a curfew can be imposed at Livermore Airport. She makes this claim without citing any source for her "recent information we found". Well, here is the real story, and anyone can research it.
The Airport Noise and Capacity Act (ANCA) of 1990 makes any airport use restriction subject to FAA approval. Some airports in California, like San Diego Lindberg Field with its curfew, have restrictions that existed prior to ANCA and these are grandfathered in. ANCA is very specific and onerous with regard to what any restriction must meet in order to be approved. This law has the effect of ruling out restrictions such as curfews and fines. This is why Livermore’s night flying policy is voluntary and cannot easily become a curfew.
My advice to all is first research the topic. At least cite a source for your "recent information.