With an engine for aircraft with high electric power demand, the power of the low-pressure shaft operating in a lower speed range is transmitted to the high-pressure shaft by an electromagnetic clutch. Isolated nucleic acid fragments and recombinant constructs comprising such fragments encoding \u03949 elongases along with a method of making long-chain polyunsaturated fatty acids using these \u03949 elongases in oleaginous yeast are disclosed. 45 or less; and the mass ratio of the content of 1,3-diacylglycerol to the content of 1,2-diacylglycerol,, in the diacylglycerol is 1.