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Refer to figure.
What does the ‘O’ followed by the letters ‘KABC’ indicate?
  • A
    A designated alternate airport.
  • B
    An off-route VOR/DME.
  • C
    The destination airport.
  • D
    An off-route airport.

An "off-route airport" is any airport that is not entered into the FMC as the destination airport for that specific flight.
An Off-route airport is displayed on the EFIS screen in the MAP mode. It is identified by a circle symbol "O" and the 4-letter ICAO identifier.

Note: Departure and destination airports are identified by the symbol of a runway: ||.

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