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Communicationsmedium#1276

'CROSS ALPHA AT FL150 OR ABOVE' instructs the pilot to:

A

Descend to FL150 at waypoint ALPHA

B

Be at or above FL150 when crossing waypoint ALPHA

Correct
C

Maintain FL150 until ALPHA

D

Hold at ALPHA at FL150

Explanation

This altitude restriction requires the aircraft to be at FL150 or higher when crossing the specified waypoint.

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