Hello,
There is an annoying issue with the airship platform, since it leads airships, the selling point of this expansion, quite ad absurdum:
If an island has an airship platfrom, even airships with normal non-mail cargo use this airship platform if it is on the closest route from their last island (not last waypoint on their trade route). Also, if the airship platform is currently occupied, the airships will wait in a queue for it to become free again. And as a player you want to have airship platforms on all of your inhabited islands because of the powerful mail feature. However, the airship platform is [censored] horrible, since it has a base loading speed of about 2 tons per second which can be upgraded via a trade union specialist to 3.5 tons per second. In contrast, a single Docklands pier has a loading speed of 25.5 tons per socond, which sums up to 382.5 tons per second for the whole docklands complex. Thus an airship platform will already become a bottleneck, if a player wants to supply a medium sized island entirely by airships. Also, if a player has a high end crown falls with 2 million inhabitants, the throughput of the airship platform will not even be sufficient to fulfill the entire mail demand of this island.
I suggest, that you either introduce further upgrades to the airship platform (building levels, specialists, loading wharfs) or that you increase its base loading speed to somewhere in between of 50 and 100 tons per second, or to give the player an option to reserve airship platforms only for mail airships, so that regular cargo airships always unload at piers.
Best regards,
Fiep_Fiep