what is, and how do you create alliance routes?
An alliance route is a route you have from one of your alliance partners hubs to another airport.
To create one:
First you must belong to one of the in-game created alliances.
Then you must own gates at both airports (the alliance partners hub, and your chosen destination). Then you just create the route like normal. You select that alliance partners hub from the menu for Origin, and the chosen destination from the destination menu.
