Hello Patson!
Would you consider my proposal about airplane maintenance?
What I realy like about this game is it's pretty realistic in many aspects.
And I'm afraid that adding a discount on airplane maintenance based on a manufacturer/home base in not very realistic.
How about adding a possibility to "build" a maintenance hangar - exactly the same way as we can build a lounge? It could be pretty cheap or free, it's up to you. For each airline base there could be max two hangars. And to make thinks more challenging, there could not be hangars for Airbus and Boeing at the same time. So players could create cheaper maintenance for example Airbus+Bombardier or Boeing+Embraer etc. Some of the new plane types (I don't know which are going to be added) could be together in other groups.
Other way could be more simple, not depending on each hub. In Office tab there could be a choice to choose two manufacturers for which you want to have a discount globaly.
Anyway I mean it would be nice if players could have a possibility to actively influence their maintenance discount wherever a hub is.