Mysterious jet noise over North Cali explained (courtesy of Juan Browne)
North California, USA: Juan Browne gives a quick explanation for the source of the "mysterious" jet noises heard regularly in many aeres of North California. Juan is a professional airline pilot and has been reporting on different environmental and technical events in California before as an amateur journalist, including his great footage from the ongoing work at the Oroville dam work site.
All credit for this clip goes to Juan Browne (youtube:blancolirio).