sentences:  The usual tug was the Ilyushin Il-12.One Yak-14 was flown to the North Pole in 1950, while another example of the glider's versatility took place in March 1954, when four Yak-14s made a long-distance flight to an ice station on an ice floe drifting on the Arctic Ocean, with the supplies delivered including a large bulldozer.The gliders flew from Tula on March 10, with several stops at Omsk, Krasnoyarsk and the Schmidt Cape, on Sakhalin island in the Far East, before reaching SP-4 in early April during a heavy freeze.