Very cool! I believe that was actually a heavily modified Boeing 747 that flew over your house...with the Endeavor in piggyback, headed for L.A. International and then on to Edwards Air Force Base.
Tomorrow, at 7:15am it will and take a four-hour low-flying tour of California, from Sacramento to San Francisco to the L.A. Basin. Part of the flight will include paying homage to several of the businesses and organizations that have supported the manned spaceflight program over the years, such as the NASA Jet Propulsion Laboratory, Griffith Observatory and the town of Mojave, home of more than one aerospace company. In addition, photo-opportunities will be available as the orbiter flies over Disneyland, the Getty Center and Universal Studios. An excellent opportunity for others in it's path to view.