Abstract: Two gas turbine engines are interconnected through a pneumatic, mechanical, hydraulic, or power link. This power link runs from the gas producer shaft of one engine to the gas producer shaft of the other engine either delivering or absorbing power directly to or from each other. The gas producer section of a gas turbine engine comprises a compressor directly coupled to a turbine which drives the compressor and a combustor positioned between the compressor and the turbine. The unit delivers hot gases to another turbine on a separate independent shaft which is the output power shaft for the engine. Through the use of clutches, swash plates or valves, selectable operating modes are achieved. Such a two engine system has been found to exhibit superior performance over a single engine system which includes maximum power boost and better full consumption at low powers.