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Crystal, and Ialte Elmo airports cannot be seen by approach control. This limits the capacity of these uncontrolled, nontowered reliever airports. There aze four air traffic control towers in the terminal azea, located at Minneapolis- St. Paul International, Flying Cloud, Crystal, and St. Paul Downtown airports, that also provide ATC services. Towers use air/ground communications, visual signaling, and other devices to provide ATC services to aircraft operating is the airport movement azea. The airport movement area is described as the traffic pattern and the airspace in the immediate vicinity of an individual airport. For example, a general aviation aircraft operating IFR enroute to Flying Cloud would beradar-vectored by approach control to a point where the pilot could self-navigate to the final approach course. The aircraft is then turned over to the tower for traffic information or advisories for the airport. When the pilot reports the airport in sight or the tower reports sighting the aircraft, approach control is advised, and the next aircraft can be vectored into position for the approach. Under current operating procedures in the Minneapolis terminal area, IFR capacity for the relievers and other general airports in the northern segment of the azea could be enhanced if radar coverage in the north went to the surface or IFR circling minimums could be obtained. Many larger approach control facilities aze now equipped with two ASR radaz systems in order to have complete coverage in the terminal area. To determine the most effective placement of such a facility, a detailed airspace analysis would be required. Such coverage would also facilitate equipping the reliever airports with radar monitors and making them limited approach control facilities. Ideally, the reliever airfields should be equipped with a tower and IFR landing aids so that training and proficiency practice can take place in an ATC-controlled environment. The type of training activity that creates congestion at uncontrolled airports is practice takeoffs and landings. This is done by what is called touch-and-go operations, where the pilot, instead of coming to a full stop after each landing, merely touches down and then immediately takes off and stays in the traffic pattern. There can be several aircraft conducting this activity, which is called a closed patterns operation (e.g., all aircraft aze III-26