A planetary gear system for a gas turbine engine with a plurality of planetary gears coupled to a carrier device, with front planetary gears mounted on pins in a front row and aft planetary gears mounted on pins in an aft row, the two rows being parallel to each other in the axial direction of the planetary gear system. The carrier device includes a ring-like base structure around a rotational axis of the carrier device, the pins are coupled to of the carrier device through first and second extension elements for the positioning of the pins relative to the base structure. The second extension elements axially extending the respective pins further away from the base structure than the pins positioned by the first extension elements.