Aircraft noise is the most temporally compressed of the thirteen hazards in this Field Guide. A jet on approach is loud for forty-five seconds, quiet for ten minutes, loud for another forty-five seconds. Whether that pattern is a non-event or a daily reshaping of the soundscape depends almost entirely on where your house sits relative to BNA's runway alignments.
§ I · The surface
Nashville International Airport (BNA) operates four runways arranged in two pairs: 02L/20R and 02C/20C running roughly north-northeast to south-southwest, and 13/31 running northwest to southeast. The runway numbers correspond to compass bearings (rounded to ten degrees), so 02L points at about 20 degrees and 20R points at the opposite 200 degrees. The third digit on 02L and 02C is the "left/center" designation for parallel runways.
What this means in practice: aircraft taking off and landing follow the runway alignment for a several-mile corridor on each end. A flight inbound on Runway 20R approaches from the north-northeast and overflies neighborhoods along that bearing — Madison, parts of Inglewood, East Nashville — in the final five to seven miles of descent. A flight outbound on Runway 02L departs northeast and overflies the same corridor in the opposite direction. Runway 13/31 produces a different corridor running across Donelson and parts of Hermitage to the northwest, and across the southeastern county edge toward Antioch and La Vergne.
BNA is in the middle of one of the steepest passenger-traffic growth curves of any U.S. airport. Annual passenger counts have roughly doubled over the last decade. Operations — takeoffs and landings — have not grown at the same rate, because individual flights now carry more passengers, but the trend is upward across both axes. The airport's master plan documents the projected operations growth and the associated noise contour evolution; the most recent FAA-published 65 dB DNL contour reflects current operations, not the projected ones.
§ II · The hidden layer
The FAA's regulatory framework for aircraft noise is built around the Day-Night Average Sound Level — DNL — metric. DNL is a twenty-four-hour weighted average of every sound event at a given location, with a ten-decibel penalty applied to events between 10 p.m. and 7 a.m. The penalty exists because the same noise event is more disruptive at night than during the day; the weighting attempts to capture that asymmetry in a single number.
The federal threshold is 65 dB DNL. Inside that contour, residential land use is classified as "incompatible" with aircraft noise under federal land-use guidance; airports operating with significant residential exposure inside the 65 dB contour are eligible for FAA-funded noise mitigation programs (sound insulation, in some cases voluntary acquisition). The contour is published as part of the airport's Part 150 noise study, last revised for BNA in the 2018–2020 update cycle; the contour is being revised again under the current master plan process.
What the contour does not capture: individual loud events that don't move the twenty-four-hour average. A single low-altitude departure on a quiet evening can wake every sleeper in the house and not register in the DNL calculation. The 65 dB number is the regulatory threshold, but the lived experience of aircraft noise in the residential corridors just outside the contour is real and worth knowing. Parcelscope's reporting band reflects this — the "outside 65 dB DNL contour" finding is favorable, but addresses within three miles of the airport read differently than addresses six or eight miles out, even when both are technically outside the contour.
The three-mile and five-mile distance bands matter for a second reason: flight path noise at altitude, which is the noise an aircraft makes during the descent or climb segment of its trajectory rather than at the runway threshold. The further out an aircraft is on approach, the higher its altitude and the more attenuated its noise — but residential corridors directly under the approach path at five to seven miles out still experience event-level noise that someone three blocks off the alignment does not.
§ III · What the records show
Most Davidson County addresses sit outside the 65 dB DNL contour. The contour itself is a kidney-shaped envelope wrapped around the airport's western and eastern boundaries, oriented along the runway alignments. The residential blocks within the contour are concentrated in three corridors: the immediate Donelson neighborhood adjacent to the runway 13/31 approach, the southeast edge of Antioch under the runway 02 approach corridor, and a smaller corridor in Hermitage along the runway 31 departure path.
Outside the contour, the relevant variable becomes proximity to the runway threshold rather than DNL exposure. The Parcelscope reporting band classifies addresses into rough distance categories: within three miles of a runway threshold, three to five miles, five to ten miles, and beyond ten miles. The reporting language reflects the FAA-published contour as the primary regulatory reference and adds the distance banding as the secondary lived-experience reference.
A second variable worth knowing is directional asymmetry. Aircraft generally take off and land into the wind, which means runway selection shifts depending on prevailing weather. On a typical Nashville day with prevailing south-southwest winds, departures roll out to the south-southwest (Runway 20 alignment) and arrivals come in from the south-southwest (final approach to Runway 20). Neighborhoods to the south-southwest of the airport experience more arrival noise than departure noise on those days; neighborhoods to the north-northeast experience more departure noise. Daily noise exposure is the average across all wind conditions over the year, not the worst case.
§ IV · The bottom line
Aircraft noise is the most verifiable hazard in this Field Guide. Spend a Saturday afternoon at a candidate address. Spend a Tuesday evening between five and seven. If the address sits under an approach corridor, the verification takes about ninety seconds — an aircraft will descend overhead and you will hear it. If the address sits outside the corridor, you can hear distant aircraft activity at the airport without it ever becoming a disruption.
For addresses inside the 65 dB contour, the federal regulatory framework treats the noise exposure as a known incompatibility. Buyers of homes inside the contour have access (through the airport's Part 150 program, when active) to sound-insulation funding for qualifying improvements: replacement of single-pane windows, attic insulation upgrades, exterior door sealing. The program is not always open, and eligibility is parcel-specific.
For addresses outside the contour but inside the three-to-five-mile approach corridor, the relevant question is not regulatory but practical: does the corridor reshape your evenings enough to matter? The answer varies by sleeper, by sensitivity to the sound, and by what time of day the household is most active. The honest read: aircraft noise is the one hazard where a quick site visit at the right time of day is worth more than any database reading.
The FAA publishes BNA's noise contour at faa.gov/airports/environmental/airport_noise. The Metropolitan Nashville Airport Authority's noise office at flynashville.com handles complaint reporting and Part 150 program updates.