Definition
The phonetic alphabet word used to represent the letter 'A' in radio communications, as standardized by the International Civil Aviation Organization (ICAO).
Plain English
When pilots or controllers need to say the letter A clearly over the radio, they say 'Alpha' instead. It removes any chance of confusing A with other letters that sound similar.
Context Anchor
Seen in aerodynamics, stall discussions, angle-of-attack indicators, and aircraft performance explanations.
Derivation
From the Greek letter alpha, the first letter of the Greek alphabet. ICAO chose words that are easy to pronounce and hard to confuse with each other across many languages.
Why Pilots Care
Alpha directly affects lift, drag, and stall margins; pilots monitor it to avoid exceeding critical values during maneuvers.
Intuition Check
Alpha does not mean “best,” “first,” or just the radio word for the letter A here. In this use, Alpha means angle of attack.
Example Sentence 1
Example Sentence 2
Approaching the runway, the pilot kept alpha well below the stall warning threshold.