I bought first office in Ultrawings for 7,000. I have made gold in all of the paid jobs, both 1 of 2 and 2 of 2. I need 15,000 for next aircraft beside the volcano island, but i only have 14,200. Where do i get the other money? Also, how do i do the free flight 2 of 2. Tried everything, even flying and refueling many times.