In September, Lauda finished 4th in Monza, and won the non-WC Imola event, still with the Alfa V12 engine. After that, Brabham returned to the familiar Cosworth V8. In late September, during practice for the 1979 Canadian Grand Prix, Lauda cut short a practice session and promptly informed team principal Ecclestone, that he wished to retire immediately, as he had no more desire to "continue the silliness of driving around in circles". Lauda, who in the meantime had founded Lauda Air, a charter airline, returned to Austria to run the company full-time.