Quebec — Quebec — ICAO Phonetic Alphabet

Quebec — Q and the Q-Code System

Quebec represents the letter Q in the ICAO phonetic alphabet. But Q has special significance in aviation beyond phonetics — it is the prefix for the Q-code system, a legacy shorthand from early wireless telegraphy still embedded in modern aviation.

Key Q-Codes in Aviation

Transition Altitude

The transition altitude is the altitude at which crews switch from QNH (local pressure) to QNE (standard pressure 1013.25 hPa) when climbing. Below the transition altitude, aircraft fly at altitudes; above it, they fly at Flight Levels. The transition altitude varies by country — typically 3,000–18,000 ft.