text: Air Traffic Control
  Term Meaning
  ABORT Do not complete landing or takeoff (liftoff).
  ACKNOWLEDGE Did you receive and understand the message?
  AFFIRMATIVE Yes.
  BE ADVISED Indicates additional information is forthcoming, such as an unusual condition
  or hazard to flight.
  BREAK That is the end of my transmission to you. The following message is for
  another aircraft. OR, that is the end of this part of the message. The next
  portion follows.
  CONDUCT GO-AROUND Do not land. Circle the landing area, and begin another approach.
  CORRECTION I gave you some incorrect information. The correct information follows.
  EXECUTE Drop personnel or equipment.
  FORM YOUR OWN You might enter the traffic pattern at your discretion. (Most suitable for
  APPROACH. aircraft with a slingload or for aircraft flights.)
  GO AHEAD Proceed with your message.
  I SAY AGAIN I am about to repeat my previous message.
  LAST CALLING I do not know the identity of the station trying to establish communication.
  STATION
  MAYDAY This is an emergency—clear the airways.
  NEGATIVE No.
  NO DROP Do not drop personnel or equipment.
  OUT That is the end of my transmission; you need not respond.
  OVER That is the end of my transmission; please respond.
  READ BACK Repeat message.
  REPORT Contact the control facility when you reach the location (or distance from the
  control station) that I am about to designate.
  ROGER I received and understand your transmission.
  SAY AGAIN Repeat your message.
  STAND BY Pause for a few seconds. OR, prepare to drop personnel or equipment.
  STATE CALL SIGN Identify your aircraft.
  STATE INTENTIONS Tell me your plans.
  STATE LOCATION Tell me your exact location.
  UNABLE TO APPROVE I must refuse your request.
  VERIFY Check with the originator.
  WILCO I understand and will comply.
  WORDS TWICE Communication is difficult; transmit each phrase twice.
  YOU ARE I do not understand the transmission.
  UNREADABLE
  (BROKEN OR
  GARBLED)
  Table 3-3. Terms.