kptk new terminal building located @ 6500 patterson parkway, waterford, mi 48327, oakland county international airport covers area of 750 acres (300 ha) @ elevation of 981 feet (299 m) above mean sea level. has 3 asphalt paved runways: 9r/27l 6,521 150 feet (1,987 x 46 m); 9l/27r 5,676 100 feet (1,730 x 30 m); 18/36 2,582 75 feet (788 x 23 m). for 12-month period ending december 31, 2011, airport had 119,347 aircraft operations, average of 326 per day: 90% general aviation, 7% air taxi, 1% scheduled commercial , <1% military. @ time there 627 aircraft based @ airport: 60% single-engine, 21% multi-engine, 16% jet, 2% helicopter, <1% glider , <1% ultralight. hush house added airport facility in 2004, part of noise abatement project, ground run-up enclosure, or hush house. 3-sided structure used aviation mechanics testing turbine powered aircraft. airplane taxied inside structure , turned exhaust , thrust facing rear wall. mechanics can run engines @ high power. majority o...