What are matierals?

How can I get materials?

In order to get materials, you have to assign cargo plane to a destination, then wait for it to come back to your airport with the chosen materials.

How can I change materials?

To change materials, you have to change the destination of your plane, then choose the destination that allows you to get the material you need.

How can I send materials to a different city?

In order to send materials to a specific destination, you have to assign a cargo plane to that destination. Then materials will be automatically transfered to this destination if you have enough pieces in your warehouse.