Both communities suffer from airport noise during certain times of the year and under certain weather conditions. We live near SFO and when it's foggy at night, the sound from the planes taking off bounces off the low cloud ceiling and is heard everywhere around the airport, north and south. When there are major storms in the winter, and winds are blowing certain ways, the planes must take off towards Millbrae and Burlingame and make sharp turns over this highly populated area. This doesn't occur very often, though. As for San Mateo and Hillsborough, no air traffic from SFO flies over these communities directly at low altitudes. Airplane noise is muted around these areas and is not something that is really objectionable by local residents. There are no real estate forms alerting buyers to noise patterns in either Hillsborough or San Mateo, these forms are for San Bruno, Pacifica, South San Francisco and Daly City only.