The FAA uses a Day Night Average Sound Level ... It also applies 10 decibels on flights between 10 p.m. and 7 a.m. Airport noise contours with decibel levels of 60-65 DLN and above are considered ...

And some neighborhoods that fear they will be subjected to more noise are fighting back in court. On Dec. 19, the Federal Aviation Administration began its first overhaul in decades of the jet ...