What is the correct process for a commercial drone operator to obtain airspace permission to fly within a controlled aerodrome's ATZ?
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A
Contact the aerodrome's air traffic control (ATC) or AFIS unit directly and obtain verbal or written permission before flight
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B
Submit a NOTAM through NATS at least 7 days in advance
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C
Register the flight on the CAA drone portal — this automatically grants ATZ access
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D
No permission is needed if the flight is below 50 m AGL within an ATZ