_______ is the primary method for ATC to provide separation between aircrafts for landing.
A. GPS
B. position report
C. radar vector
D. experience
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With four dimensional approach clearances for commercial aircraft, _______ is the fourth dimension.
A. time
B. altitude
C. speed
D. direction
Ground Control is responsible for the airport "movement" areas, as well as areas not _____to the airlines or other users.
A. borrowed
B. rent
C. released
D. lend
52.An airport includes all taxiways, inactive runways, holding areas, and some transitional aprons or intersections where aircraft arrive, having _____the runway.
A. left
B. vacated
C. started
D. landed
Any aircraft, vehicle, or person walking or working in airport areas is required to have_____from Ground Control.
A. clearance
B. permitted
C. allowed
D. approval