A jet engine for supersonic aircraft which enables supersonic flight and high fuel efficiency to be achieved while suppressing noise at take-off. The engine comprises a front engine consisting of a turbofan engine, and a rear engine or engines consisting of a turbofan or turbojet engine disposed to the rear of said front engine, the rear engine(s) being coupled switchably by a tube to the bypass duct of the front engine, the air inlet(s) of the rear engine(s) being coupled to the bypass duct during supersonic flight, or during acceleration to supersonic speed, whereby the pressure and temperature of the bypass air from the front engine is raised by the rear engine(s), and the air inlet(s) of the rear engine(s) being separated from the bypass duct during take-off, in such a manner that the bypass air is discharged without the temperature or pressure thereof being raised further.
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