A process for producing a hydrocarbon stream comprising hydrocarbons boiling in the jet fuel range, said process including: a) passing a synthesis gas (syngas) stream including a carbon oxide and hydrogen over a fixed bed including a dual-function catalyst active in the conversion of syngas to the oxygenate(s) methanol (MeOH) and/or dimethyl ether (DME), and the conversion of said oxygenate(s) to an olefin product stream; wherein the dual-function catalyst including: a MeOH synthesis catalyst; and an oxygenate conversion catalyst; b) passing at least a portion of the olefin product stream through an oligomerization step over an oligomerization catalyst, and optionally subsequently conducting a separation step, for thereby producing an oligomerized stream; c) passing at least a portion of the oligomerized stream through a hydrogenation step over a hydrogenation catalyst, and optionally subsequently conducting a separation step, for thereby producing said hydrocarbon stream including hydrocarbons boiling in the jet fuel range.