Control area

{
  "id": "MLC-T-MET-010447",
  "term": "Control area",
  "field": "Meteorology and atmospheric science",
  "definition": "A controlled airspace extending upward from a specified limit above the ground or water, established to protect instrument flight rules traffic en route. Under ICAO rules its lower limit is at least 200 m (700 ft) above the surface. An upper limit is defined only where control is not provided above it or where the area lies beneath an upper control area.",
  "url": "https://mlchart.com/terminology/meteorology/control-area/"
}