The minute you buy an extra plane, the overall fee changes. It also changes every day due to the plane getting older.
I understand that, but why make things complicated this way? AM separates the maintenance crew paychecks and maintenance fees for a plane - why? Is there any game play improvement because of this? Why can't this be one fee instead of 2?
Just to make an example:
1/2/1984 Monthly Engineer & Tech Services Salaries €1,797,750
1/2/1984 Monthly Maintenance Fees €70,276,722
1/1/1984 Monthly Engineer & Tech Services Salaries €1,797,750
1/1/1984 Monthly Maintenance Fees €64,553,458
wtf?! salaries the same, maintenance up by 6M €?!
On the other hand, the game features leases. How the hell can I calculate the lease fee that will keep me profitable? Trial and error? For game play sake don't bring micromanagement in a game that does not provide it.