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The ATC informs the pilot:

"You are now entering airspace Delta"

What is the appropriate response by the pilot?

  • A

    Wilco.

  • B

    Entering.

  • C

    Roger.

  • D

    Airspace Delta.

Refer to figure.
ICAO Annex 10 Volume II
5.2.1.5 TRANSMITTING TECHNIQUE

ROGER → “I have received all of your last transmission.”
WILCO → (Abbreviation for “will comply”.) “I understand your message and will comply with it.”


The ATC informs the pilot that he/she is entering controlled airspace. This is an informative transmission, and the pilot should indicate to the ATC that he/she has received the message. Therefore, the term 'Roger' may be used as a response to the ATC.

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