FAA's NextGen satellite flight paths over Howard County, MD turned 300 annual noise complaints into 620,000 by concentrating all BWI departures over the same houses

Before 2015, Baltimore-Washington International Airport received roughly 300 noise complaints per year. After the FAA implemented its NextGen satellite-based navigation system, BWI received 620,276 noise complaints in 2021 alone -- a 2,000x increase. The reason is precise: NextGen replaced the old radar-based system where planes spread across a wide swath of sky with GPS-guided routes that funnel every departure along an identical, narrow corridor. Residents of Howard County, Maryland, particularly those under Runway 28 departure paths, went from occasional overflights to continuous, repetitive jet noise all day and night. The noise is now concentrated on the same houses, block after block, flight after flight. The health consequences are not hypothetical. Residents under these concentrated flight paths experience chronic noise exposure well above the WHO's 55 dB daytime and 45 dB nighttime thresholds. Studies consistently link aircraft noise above these levels to increased cardiovascular disease, elevated blood pressure, impaired children's reading comprehension, and chronic sleep fragmentation. Property values in affected neighborhoods have dropped measurably. Residents report that they cannot hold conversations in their backyards, cannot sleep with windows open, and that the noise penetrates even closed double-pane windows. Howard County filed a federal lawsuit against the FAA seeking judicial review of the flight path changes, which was ultimately dismissed by the court. This problem persists because the FAA has near-total federal preemption over airspace. Local governments, counties, and states have essentially no legal authority to regulate flight paths, altitudes, or frequencies. The FAA's environmental review process for NextGen evaluated noise using the outdated DNL 65 dB metric, which averages noise over 24 hours and thereby mathematically dilutes the impact of hundreds of individual loud overflight events. A neighborhood can be subjected to 80+ dB peaks dozens of times per day and still fall below the DNL 65 threshold because the average includes quiet overnight hours. The metric itself is designed in a way that makes it structurally difficult for affected communities to meet the legal threshold for relief.