fees

I know the more a plane is landing at an airport its fees go down. Is that just for that plane or all flight to that airport?

Can you please explain what you are meaning with "the more a plane is landing at an airport its fees go down" - we don't have anything like this in AirlineSim

I guess he's talking about the splitting of costs based on the number of flights each aircraft performs.

Basically, your company fixed costs (DB III & DB IV & DB V (salaries / leasing / etc.)) will decrease per flight if more flights are planned with a certain aircraft. Flight based costs (DBI & DB II (fuel / fees / handling / ATC)) will not change with the number of flights.

-> The more flights you perform, the more possibilities to split costs between them = more profit.

Please correct me if I'm wrong.