The exercise, this year named ''Blue Sky 18,'' is required every three years by the Civil Aviation Authority and is in addition to monthly drills.
Auckland Airport's general manager of operations Anna Cassels-Brown said the exercise could be cancelled at any time if a real emergency should occur.
The airport's emergency service is comprised of 68 people running four shifts around the clock.
It has four Rosenbauer Panthers, one domestic fire truck, a command vehicle and a medical response vehicle. The service also has two hovercraft, a catamaran and a monohull jet boat.
Two crashes at or near the airport - which opened in January 1966 - have resulted in fatalities.
An Air New Zealand DC-8 on a training flight crashed in July that year, killing the pilot and the flight engineer. In 1979 a Fokker Friendship on a flight from Gisborne crashed into the Manukau Harbour 1km short of the runway, killing a crew member and a passenger.