June 23, 2010, at 23:10 UTC
Santiago Control Center received reports from three aircrafts on their way to Arturo Merino Benitez Airport (Santiago International Airport). Two of them belonged to commercial airlines. The third airplane belonged to the Chilean navy and was called Alfa Pelícano.
The flight PCP 521 reported a traffic coming across his trajectory going from West to East at a few thousands feet below. The flight Sky 169 flying on a different skyline confirmed the observation.
At about the same time, the navy airplane reported a traffic coming up in the opposite direction. The object passed underneath it and soon came back across its trajectory at the same level going from West to East.