Why do you think Miramar has a low chance of being used? Do you think it’s more likely to expand Lindbergh field? Will the voters ultimately decide?
If you are within several miles of the airport, you will certainly hear the airplanes overhead, if they come over your house, right? And they come in from the east. Airplanes take off and land toward the west, against the wind. So if Miramar is used, then the area east of Miramar would be in the direct flight path. It may be quieter than F-18s, but you can definitely hear it.