sentences:  The new majority owner demanded Kar-Air to cease domestic flying, concentrating on charter flights (mainly to the Mediterranean) holiday resorts instead.For this purpose, Aero O/Y handed over two of its own DC-6 aircraft, which Kar-Air also used for multiple stopover round-the-world flights.The DC-6s remained the backbone of the Kar-Air passenger fleet until 1972, when the jet age was joined with the introduction of the 189-seat Douglas DC-8.