What is FL (Flight level)?

Flight level (FL) is an aircraft’s altitude at standard air pressure. Flight levels are depicted by a number, which is the nominal altitude, in hundreds of feet, while being a multiple of 500 ft, subsequently continually finishing in 0 or 5. Flight levels are utilized to guarantee safe vertical division between aircraft, despite natural local variations in atmospheric air pressure. Flight levels are normally assigned in writing as FLxxx, where xxx is a two- or three-digit number showing the pressure altitude in units of 100 feet.