برای اینکه الفبای انگلیسی تبدیل به گفتاری بدون خطای شنیداری از سوی شنونده در ارتباطات هوایی شود، ناگزیر این حروف و اعداد به صورت زیر از سوی افراد بیان می شود:
ITU Phonetic Alphabet and ICAO Numbers
3 TREE or THU-REE
An instruction to the receiver that the transmission must be acknowledged.
Reference all of a transmission after the word or phrase given.
Reference all of a transmission before the word or phrase given.
I have higher priority traffic. (Used with care)
Done using this frequency.
What you have transmitted is correct.
I have made an error and the correct information follows.
Numerals or numbers follow.
Letter or letters follow.
I SAY AGAIN:
I repeat my last transmission.
The next word will be spelled out phonetically.
This is the end of the transmission, no reply is expected.
This is the end of my transmission at this time, your reply is necessary.
I have received your transmission satisfactorily.
Repeat the last transmission.
Used primarily for punctuation, as in SYMBOL FOR Comma.
This transmission is from the station whose call sign immediately follows.
That which immediately follows is the date-time group of the message.
I must pause for a few seconds.
I must pause longer than a few seconds and will recontact you by call sign.
I have received your signal, understand it, and will comply. (Since the meaning of ROGER is included in that of WILCO, the two prowords are never used together.)
Designates the word after...as SAY AGAIN WORD AFTER.
My last transmission was incorrect, correct transmission follows.