Sky Trading Post is a crucial Infrastructure building, available in 
The Passage DLC, which can be built only on four glacier islands in The Arctic, granting the ownership of the island it is placed on. Since the glacier islands lack an accessible coastline, the sky trading post functions as an equivalent of the trading post for these islands. Therefore just like trading posts, the sky trading post provides space for storing goods and acts as a Warehouse by having several loading ramps which can be used by buildings' carts to load and unload goods. It also allows to transfer goods and items between airships and the island. Only one sky trading post can be built on an island.
Constructing the Sky Trading Post[]
A sky trading post can be constructed by flying above an unoccupied glacier island with an airship which has enough construction materials on board. When the airship has enough free room underneath, a transparent sky trading post appears on the island, clicking on it and then confirming the construction places the sky trading post and claims the ownership of the island. In addition to coins and construction materials, building sky trading posts requires specific amount of influence, depending on the size of the island (and depending on how many influence points are still available within the free limit for islands in the expansion category). Each glacier island is worth around 4 
.
Sky Trading Post connection[]
Many buildings placed on the glaciers, such as residences, need to be connected to the sky trading post. Such a connection can rely on a road connecting a building directly to the sky trading post, or can rely on a road leading to warehouses. Warehouses that are connected to the sky trading post can serve as a source of the connection for other buildings.
Island takeover[]
Glacier islands cannot be attacked by ships or airships and therefore cannot be taken over via military means. It is possible only by claiming all of the island's shares and then buying out the island itself.
Upgrades[]
At first only the small version of the sky trading post can be constructed, it provides 2 loading ramps and 75 tons of storage space. It is possible to upgrade the small sky trading post in order to gain more loading ramps, more storage capacity and faster loading speed. On glacier islands there are no other means of increasing the storage capacity or the loading speed.
The sky trading post can be upgraded up to two times. Each upgrade has its unlock condition and requires construction materials. Upgrades provide additional loading ramps and storage capacity, up to a maximum of 4 loading ramps and 250 storage capacity. The sky trading post has no maintenance costs on any level, so except for initial upgrade costs there are no downsides to upgrading it.
| Level | Properties | Construction/upgrade cost | Unlock condition |
|---|---|---|---|
| Small | 75 storage 2 loading ramps loading speed: 2 t/s |
2500 10  8 
|
|
| Medium | +75 storage +1 loading ramp loading speed: 3 t/s |
2500 15 10
|
|
| Large | +100 storage +1 loading ramp loading speed: 5 t/s |
10000 20 15 20 
|
Screenshots[]
