Hong Kong civil aviation authorities say there have been six instances of aircraft flying too close to each other but three were technical issues.
The other three were due to a breach in the minimum safety distance, the Hong Kong Economic Journal reports, citing local news agency FactWire.
The incidents occurred between Jan. 19 and 30.
Li Tin-chui, director general of the Civil Aviation Department, said the incidents had nothing to do with the new Air Traffic Control System (ATC).
The Autotrac 3 ATC, manufactured by US defense company Raytheon, cost the government HK$570 million (US$73.46 million).
Li said these incidents normally occur up to twice a month, regardless of the ATC system used.
He said the new system should not be judged by such incidents but by its overall performance.
International aviation standards require planes to maintain a vertical clearance of at least 1,000 feet and be at least five nautical miles apart.
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