What is Four?
In this glossary, Four refers to: The ICAO/FAA radiotelephony spelling for the numeral '4'. Used to clearly communicate headings, altitudes, frequencies, and runway numbers in ATC transmissions.
How is Four used in aviation?
In aviation communication, this term appears in contexts such as: "Descend and maintain four thousand feet, expect the ILS approach runway one four."
Why does Four matter in aviation?
Four matters because it supports clear communication in Phonetic Alphabet contexts for Pilots, Air Traffic Controllers, and Cabin Crew. It also connects to aviation training and exam language such as ICAO Level 4, ICAO Level 5, ICAO Level 6, and EASA FCL.055.
Who uses Four?
Four is mainly used by Pilots, Air Traffic Controllers, and Cabin Crew.
What category does Four belong to?
In this glossary, Four is grouped under Phonetic Alphabet. Related pages in this category explain adjacent procedures, commands and operational concepts.
Where does this definition come from?
This definition is sourced from ICAO Doc 9432, FAA PCG and published by Protermify Aviation as a static aviation reference page.