CASA Formation Definition

Two or more aircraft flown in close proximity to each other and operating as a single aircraft with regard to navigation, position reporting and control. Note: A CASR Part 61 flight activity endorsement is required when aeroplane or helicopter pilots are flying in formation (flying in formation is defined slightly differently to the definition of formation in the Aeronautical Information Package (AIP)). Civil Aviation Safety Regulation (CASR) 91.205 details conditions on formation flights.