Learn the aviation phonetic alphabet A–Z, how ATC uses it for callsigns, taxiways and ATIS, and which radio mistakes cause confusion.
The aviation phonetic alphabet is the ICAO radiotelephony spelling alphabet: Alfa, Bravo, Charlie and so on. Pilots and air traffic control (ATC) use its fixed code words to transmit letters clearly when static, accents or similar sounds could otherwise confuse callsigns, taxiways, navigation identifiers and ATIS information codes.
For our Aviation & Real-World Flying readers, the key point is that this is a spelling alphabet, not a secret code or a linguistic pronunciation system. Each word represents one letter, and everyone uses the same words so that, for example, B, D, E, G and P are less likely to be mistaken for one another.
What are the aviation phonetic alphabet words?
The civil aviation standard is the ICAO radiotelephony spelling alphabet, also commonly called the NATO phonetic alphabet.
| Letter | Code word | Letter | Code word |
|---|---|---|---|
| A | Alfa | N | November |
| B | Bravo | O | Oscar |
| C | Charlie | P | Papa |
| D | Delta | Q | Quebec |
| E | Echo | R | Romeo |
| F | Foxtrot | S | Sierra |
| G | Golf | T | Tango |
| H | Hotel | U | Uniform |
| I | India | V | Victor |
| J | Juliett | W | Whiskey |
| K | Kilo | X | X-ray |
| L | Lima | Y | Yankee |
| M | Mike | Z | Zulu |
Alfa and Juliett are the official international spellings; “Alpha” and “Juliet” are common informal renderings. The standard spellings help produce consistent pronunciation across languages. Our explanation of Bravo and Foxtrot in aviation radio messages shows how individual code words work in context.
Where does ATC use the phonetic alphabet?
ATC uses the alphabet whenever a letter must be unmistakable, particularly in callsigns, ground instructions and coded information.
- Aircraft registrations:
G-ABCDbecomes “Golf Alfa Bravo Charlie Delta”, whileN172SPbecomes “November One Seven Two Sierra Papa”. - Taxiways: Taxiway B is “Taxiway Bravo”; D5 is normally “Delta Five”. A clearance might be “Taxi via Alfa, Bravo, hold short Runway Two Seven”.
- ATIS codes: A controller may advise that “Information Foxtrot is current”. Foxtrot identifies the current ATIS edition.
- Navigation identifiers: Letters in a VOR, NDB or other coded identifier can be transmitted using the alphabet when the identifier itself is being stated.
- Clarification: A pilot or controller can spell an unfamiliar name or ambiguous identifier when normal pronunciation has not been understood.
Airline flights work differently. A written airline code is usually replaced by an approved telephony designator, so a British Airways flight uses “Speedbird” rather than spelling B and A as Bravo Alfa. We cover that distinction in our guide to how airline identifiers become spoken ATC callsigns.
When is the phonetic alphabet not used?
ATC does not replace every spoken letter or number with a code word; established aviation terms and numeric phraseology still apply.
- Runway
27Lis “Runway Two Seven Left”, not “Two Seven Lima”. - A frequency is spoken as numbers with “decimal” or the locally prescribed equivalent, not as phonetic letters.
- An altitude such as 5,000 feet uses number phraseology; it is not “Foxtrot thousand”.
- A pronounceable waypoint is normally spoken using its published pronunciation rather than being spelled letter by letter.
- “Zulu” can represent the letter Z, but in a time such as
1430Zit indicates Coordinated Universal Time.
Numbers have their own radiotelephony pronunciations. The most noticeable ICAO forms include “tree” for three, “fower” for four, “fife” for five and “niner” for nine. These are number pronunciations, not part of the A–Z spelling alphabet.
How should pilots use the alphabet on the radio?
Pilots should transmit each required code word clearly, preserve the identifier exactly and avoid inventing substitutes.
- Listen for the complete identifier. Decide whether the controller is giving a taxiway, ATIS letter, registration or another coded item.
- Use the standard word for each letter. Say “Sierra Papa”, not “Sugar Peter” or improvised words that merely begin with S and P.
- Keep letters and numbers distinct. For
N172SP, say “November One Seven Two Sierra Papa” at a steady pace. - Read back required items accurately. Preserve taxiway letters, runway instructions and callsign elements rather than paraphrasing them.
- Resolve uncertainty immediately. Use “say again”, “confirm” or spell the disputed element rather than guessing. Standard requests and readbacks are explained in our coverage of practical ATC phraseology.
An aircraft registration should normally be transmitted in full on initial contact. Use an abbreviated registration only after ATC has introduced that abbreviation; shortening it yourself can create a callsign conflict. Simulator pilots can find suitable formats and examples in our advice on choosing and speaking a flight-simulator callsign.
What mistakes cause the most confusion?
The most common errors are mixing standard code words with ordinary words, spelling items that have established pronunciations and treating every visible abbreviation as part of the callsign.
“Roger” is another frequent trap: it means that a transmission has been received, not the letter R in the modern aviation alphabet. R is “Romeo”. Likewise, a word such as Delta may represent D, an airline telephony designator or part of a named item; the surrounding transmission determines its meaning.