ICAO & NATO alphabet trainer
A clear callsign starts with confident spelling.
Free with an account. The full trainer uses your microphone for spoken exercises.
An account is required for the full trainer.
Say the callsign out loud
Spell these letters using the ICAO phonetic alphabet, then reveal the example.
Tap a letter to reveal its word.
A short example. Your full training continues in your account.
Read the callsign
Look at the letter sequence before you begin speaking.
Spell it aloud
Use your microphone to say the ICAO word for each letter.
Check and continue
Review the result, then try another callsign to build confidence.
What you will practise
Make every letter easier to recognise
Knowing the alphabet is one thing. Saying a callsign without stopping to think takes practice. Build that habit by speaking it aloud.
One letter. One unmistakable word.
ICAOA → Z
Practise callsigns
Work with letter sequences instead of only reading an alphabet chart.
Speak your answer
Record the phonetic words with your microphone to practise saying them clearly.
Review your attempts
Check the result and return to your exercise history as you keep practising.
Learn the background
Put clear callsigns into a full radio exchange
Use the ATC simulator to practise the instructions and readbacks around the callsign.
SimulatorBefore your first session
Is the trainer free?
Yes. The spelling trainer is available with a free Learn ATC account.
Do I need a microphone?
Yes, for the full spoken trainer. The example on this page lets you check a callsign without recording anything.
Are the ICAO and NATO alphabets different?
The letter words used for this training are the familiar international phonetic alphabet, including Alfa, Bravo and Charlie. In aviation it is usually called the ICAO alphabet.
Continue in the full trainer.
Practise with more examples and review your answers.
