(What crap about the military and Wiccanism which is a bunch of 8@%#%@^!!!)
Yesterday in the early afternoon somewhat north of Petaluma (maybe towards Santa Rosa, it's been a long couple of days of driving and I can't remember exactly) on Highway 101 while driving north, mrs lj and self saw three military planes (too stupid to know what kind) flying tighly next to a smaller white plane, heading roughly SW. Looked like they escorting it. They were all flying really close together. Hmmm.
IIRC there's an Air Force base near Petaluma.
It could have been training, but most likely, lately, are these hoax bomb threats and/or passenger disruptions. When these happen, the pilot calls it in and their plane usually gets an escort.