Meaning

Let me know that you have received and understood this
message.
Yes
I give you permission for what you asked.
Cancel the last clearance I gave to you.

Examine a system or procedure.
I give permission for you to continue, bearing in mind
the conditions already given.

Have I correctly received the following … ? or Did you
correctly receive this message ?
Contact by radio …

That is correct.
An error was made in the last transmission. What
follows is correct.

Assume that the last transmission was not sent.
Tell me how good this transmission is on a 1 to 5 scale

where 1 = unreadable (cannot understand) to
5 = excellent reception (no difficulty in understanding).
I am repeating in order to make my meaning very clear.
My transmission is finished and I want a response from

you.

This exchange of transmissions is finished. I do not want
a response from you.
Proceed with your message.
Repeat all, or the specified part of this message back to

me exactly as received.
I want to know or I want to have.
I have received all of your last transmission.
Repeat all, or the following part of your last

transmission.
Speak more slowly.
Wait and I will call you.
Check and confirm with me.
I understand your message and will comply with it.
(as a request) Communication is difficult. Please send

every word or group of words twice.
(as information) Because communication is difficult,
every word or group of words in this message will be
sent twice.

Aircraft registration codes
These codes are painted on all aircraft, showing their country of registration.
3A 3B 3C 3D 3X 4K 4R 4U 4X 5A 5B 5H 5N 5R 5T 5U 5V 5W 5X 5Y 6O 6V 6Y 7O 7P 7Q 7T 8P 8Q 8R 9A 9G 9H 9J 9K 9L 9M 9N 9Q
9U 9V 9XR 9Y A2 Monaco
Mauritius
Equatorial Guinea
Swaziland
Guinea
Azerbaijan
Sri Lanka

United Nations Organisation
Israel
Libya
Cyprus
Tanzania
Nigeria
Madagascar
Mauritania
Niger
Togo
Samoa
Uganda
Kenya
Somalia
Senegal
Jamaica
Yemen
Lesotho
Malawi
Algeria
Barbados
Maldives
Guyana
Croatia
Ghana
Malta
Zambia
Kuwait
Sierra Leone
Malaysia
Nepal
Democratic Republic of theCongo
Burundi
Singapore
Rwanda
Trinidad and Tobago
Botswana A3 Tonga

A40 Oman
A5 Bhutan
A6 United Arab Emirates
A7 Qatar
A9C Bahrain
AP Pakistan
B China & Taiwan
B-H Hong Kong
B-M Macau
C Canada
C2 Nauru
C3 Andorra