The Metropolitan Airports Commission owns and operates Minneapolis-St. Paul International Airport and six reliever airports.  MAC staff do not control air traffic operations or direct aircraft in flight. The Federal Aviation Administration (FAA) has sole authority over determining where aircraft will fly and how the airspace around airports is used. Operational factors such as wind and weather, the number of arrivals and departures, the time of day, construction activity and airspace safety considerations all play a part in how an airport operates at any given time.  Runway use decisions are made solely upon standard air traffic control procedures (including several noise abatement procedures). Noise complaints are not considered when making these decisions.  Noise complaints are, however, used in conjunction with operational data to corroborate specific events or to identify possible operational trends. Various cities also use the complaints to gauge and assess the level of concern about airport noise in their communities.