Flight level

{
  "id": "MLC-T-AVN-000412",
  "term": "Flight level",
  "field": "Aviation and air traffic control",
  "definition": "A level of constant atmospheric pressure related to a reference datum of 29.92 inches of mercury. Each is stated in three digits that represent hundreds of feet. For example, flight level (FL) 250 represents a barometric altimeter indication of 25,000 feet; FL 255, an indication of 25,500 feet.",
  "see_also": [
    "Flight level [ICAO]"
  ],
  "references": [
    "FAA Pilot/Controller Glossary"
  ],
  "url": "https://mlchart.com/terminology/aviation/flight-level/"
}