it does not go into the shuttle vendor (if memory serves). it goes into your ship list. if its not there go to the special unlock tab of the c-store and claim it again. make sure you have a free ship slot or it wont enter your ship list.
edit - sorry its in the ship section of the store, not the special unlock. i just tried it. claim it from the ship section and it will appear in your ship list, assuming you have space.