Game Guide: AirfieldGame Guide
VIII. AIRFIELD In Air Field, you can exchange your materials to get Treasures and Building materials. You can speed up the time by adding available Dragons. You can add up to 3 Dragons per run.
*Once the Dragon Airport Delivery has started, it will show the time remaining for it to complete. You can always speed up the time by spending diamonds.
*The Airport delivery is completed. You can now get the reward.
*You can get extra Treasure if you are lucky!