In my game world, the gates and slots are important resources because in most of airports, the # of available gates is 0. So we have to built new terminal, its okay in our hubs or main cities , but in some small cities, its gonna to be a waste.
Also, in small cities, we do not need 50 slots but still have to rent a gate ( and there are only 2-5 gates for each airport ).
Why not us share our gates and slots with our alliance members to save time and money?
I mean we can rent gates from alliance members or pay for the slots we need.
Seems that the connections between alliance members are lose in this game....