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Reference

Short pages to look things up — meant for the moment when an abbreviation is in the way and you would like to carry on reading.

• Aviation abbreviations – the abbreviations that come up most often in weather reports, on charts and on the radio, each with its source.
• ICAO spelling alphabet – Alfa to Zulu and the pronunciation of the digits.

Terms belonging to a particular subject stay with that subject — and always in the same format: code – English expansion – meaning – where it appears.

• Weather codes: METAR, TAF, SIGMET, SNOWTAM, thunderstorms.
• Altimetry: QNH and the altimeter, flight levels.
• Airspace: airspace classes, CTR, TMA, RMZ and TMZ, VFR and IFR.
• Licensing: training and licensing, instrument flying.

Related reading

• Abbreviations

Status of this page
An editorial overview for training purposes. The binding references are the applicable regulations, the Aeronautical Information Publication (AIP), NOTAM, the approved aircraft documentation and the publications of the competent authorities. NorthTrack is not an authority, an examining body or a flight training organisation.
Page current as of: 2026-09-13