The two-niner Diner at Petaluma, CA is a nice spot for a lunch and some airplane watching.
Food is usually good, but the service of late has been spotty.
Waited 40 minutes for a hamburger and it was prepared wrong. I'm based at Petaluma and have been for more than four years. I've been eating there for as long as I've had my plane based there. It might have been an off day for them, for it surely isn't the norm. The owner and workers at the restaurant are polite, courteous and friendly.