Gulfstream To End GIV Series Production With the brand new Gulfstream G500 soon to come into market Gulfstream is making the decision to end series production of the GIV. The company announced today that it will cease production of the G450 in 2018. The G450 was certified in 1987 and has since then been delivered to customers all over the world. To be specific, the executive jet airframer has delivered 870 G-IV, G-IVSP and G450s which all hold similar certificate. Nearly half of that 870 figure were of the G450 updated model.