Renegade officers in Turkey's military used tanks, fighter jets and helicopters in their July 15 attempt to unseat the government, attacking the parliament and other key buildings.
Turkey blamed it on a network of followers of the US-based Muslim cleric Fethullah Gulen, an ally turned foe of President Recep Tayyip Erdogan.
Gulen, whom Turkey wants extradited from the United States so that he may also face trial, has denied any involvement in the coup.
More than 40,000 people have been arrested for alleged involvement in the coup while tens of thousands of other suspected Gulen followers have been purged from government jobs.
The police officers are standing trial in a prison and courthouse complex in the outskirts of Istanbul include three police helicopter pilots.
They are accused of aiding the coup by not carrying out their duties, including disobeying orders to protect Erdogan's Istanbul residence on the night of the coup, according to the state-run Anadolu Agency.
"I don't have the slightest link to the (coup attempt)," the agency quoted defendant Tolga Gultekin as telling the court. "There was no flight instruction given to me."
Another pilot, Ender Kucuka, was quoted as saying that he and a co-pilot were ready to fly their helicopter but that the flight mission was canceled by a superior.
The court was scheduled to continue hearing defense statements later today and tomorrow.
The trial is the first to take place in Istanbul in connection with the coup. Some 45 soldiers are on trial in separate cases taking place in the cities of Zonguldak, Bursa and Erzurum.
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