There was, however, no emergency landing of the flight CX 2041 which had come from Hong Kong and it landed safely, Cathay Pacific said in a statement today.
"On the arrival of our freighter flight CX 2041 on 27 July 2015, from Hong Kong to Delhi, our Engineering team found parts of the left hand wing flap missing," the airline said.
The missing part was later found at the runway by Delhi airport staff, the airline said.
We are working closely with the relevant authorities and have launched an inquiry into the same, the statement said.
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Meanwhile, sources said the regulator has notified the incident to both the the aircraft maker Boeing and also to the independent US investigating agency National Transport Safety Board.
Since the incident involves a foreign aircraft, DGCA has also notified it to the Federal Aviation Administration of the US, they said.
The Hong-based carrier operates its freighter services to six Indian destinations Delhi, Mumbai, Chennai, Bengaluru, Hyderabad and Kolkata.