An incident occurred on a flight from Buenos Aires to Río Gallegos in Patagonia. Dardo Manuel Cabo was a passenger on the Aerolíneas Argentinas flight AR-648. At some point during the flight, he got up from his seat and retrieved a revolver from his luggage.

Details of what happened next are limited, but it is known that Cabo proceeded to the cabin. The events that unfolded are reported in El País, which provides further information on the incident. For more details on the events of September 28, 1966, readers can refer to the original report in El País.