Defense said: The noise is caused by the NextGen FAA mandated satellite technology.

Source: When the Town of Hillsborough asked the airport for an explanation about the increase in runway noise, the defense provided the information below to the Town quarterly newsletter that went out to all residents at the end of 2016, a year after the runway noise began.

The fact is that the NextGen technology the defense claimed was the cause of the noise had been implemented at the airport in March, 2015, almost year before the first onset of disturbing runway noise.