On 22 November 1968, the first of these saw CV-990A N5612 Polar Byrd I, which had a special Polar Path Compass (PPC) system fitted for the polar trip, by Modern's electronics department headed up by Vincent de Ceasare become the first commercial jetliner to land on and take off from the 10000 feet ice runway at the McMurdo Station airfield at Williams Field, McMurdo Sound in Antarctica.