What does 'Roger' mean in aviation communication?

'Roger' means you have received and understood the entire previous transmission.

When should 'Wilco' be used?

'Wilco' is used when you have understood the message and will comply with the instruction.

Is 'Copy' an official ICAO standard word?

'Copy' is not an official ICAO standard word; it is often used informally to acknowledge receipt but does not confirm understanding or compliance.

Can 'Roger' be used to answer a yes/no question?

No, 'Roger' should not be used for yes/no questions; use 'Affirm' or 'Negative' as appropriate.

Does 'Wilco' include the meaning of 'Roger'?

Yes, 'Wilco' implies both receipt and understanding of the message, plus the intention to comply.

Difference between Copy, Roger and WILCO

Easy4 min readCommunications

Occasionally Examined

Why this matters

Precise use of standard phraseology prevents misunderstandings between pilots and ATC, directly impacting flight safety and operational efficiency. Knowing when and how to use 'Copy', 'Roger', and 'Wilco' ensures instructions are not just heard, but also correctly acted upon.

In aviation radio communications, 'Copy', 'Roger', and 'Wilco' are standard words with distinct meanings. 'Copy' means the message was received, 'Roger' confirms receipt and understanding, while 'Wilco' means the message is understood and the instruction will be followed. Using these terms correctly is essential for clear, safe, and efficient cockpit and ATC exchanges.

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In depth

Explanation

Understanding Copy, Roger, and Wilco

Copy: This simply acknowledges that a message has been received. It does not confirm understanding or intent to act. In aviation, 'Copy' is less formal and not standard phraseology for readbacks or critical instructions.
Roger: This means 'I have received and understood your last transmission.' It is used to confirm that the entire message was both heard and comprehended. However, 'Roger' does not imply any action will be taken—only that the message is fully understood.
Wilco: Short for 'Will Comply', 'Wilco' means the message is understood and the instruction will be carried out. It combines the acknowledgment of 'Roger' with a commitment to comply with the instruction.

When to Use Each Term

Use 'Roger' to acknowledge and confirm understanding of non-actionable information.
Use 'Wilco' when you intend to comply with an instruction or clearance.
Avoid using 'Copy' in formal ATC exchanges; instead, use standard phraseology like 'Roger' or 'Wilco' as appropriate.

Key Points for Readbacks

For clearances that require action (e.g., heading changes, SSR codes, runway assignments), a readback or 'Wilco' is expected.
'Roger' is not sufficient when an instruction requires a specific response or compliance.
Never use 'Roger' or 'Wilco' to answer a yes/no question; use 'Affirm' or 'Negative' instead.

The essentials

Key Points

'Copy' only confirms message receipt, not understanding or compliance.

'Roger' means the message is received and understood, but not necessarily acted upon.

'Wilco' means the message is understood and will be complied with.

Use 'Wilco' for instructions requiring action; 'Roger' for informational messages.

Never use 'Roger' or 'Wilco' to answer yes/no questions—use 'Affirm' or 'Negative'.

Correct phraseology is essential for safety and clarity in aviation communications.

Watch out

Exam Traps & Typical Mistakes

Confusing 'Roger' with 'Wilco'—'Roger' does not mean you will comply.

Using 'Copy' as a formal readback or acknowledgment in place of 'Roger' or 'Wilco'.

Answering yes/no questions with 'Roger' or 'Wilco' instead of 'Affirm' or 'Negative'.

Assuming 'Roger' is sufficient for instructions requiring compliance.

Misunderstanding that 'Wilco' includes both acknowledgment and intent to comply.

Test yourself

Example Exam Questions

Question 2Easy

Which standard word should a pilot use to indicate both understanding and intention to comply with an ATC instruction?

Question 3Medium

How does 'Copy' differ from 'Roger' in standard RT phraseology?

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