So, in relation to my other thread, I'm starting to see we'll (or me at least) have a problem with commonality costs...
We all know the game pretty much limits airlines to 3 fleets.
Now, I'm thinking in my airline; I have convairs and DC6s... (with some DC4s about to be phased out)
In some years from now, I'll start to phase out my convairs in order to acquire new planes... I'll do the same with DC6s...
The problem is that I have 208 convairs to change (and counting).
Let's suppouse I change them for the 727s... they have a production rate of 16 planes a month... that means I'll be getting 2-3 planes a month.
Doing some math, It'll take me 7 years to replace the entire convairs fleet.
That seems ok, but if the same happens with my second fleet, then I'll be having 4 fleets for 7 years, when I'll probably start the process again in order to replace my planes again. If you don't want to have the 4th fleet penalty, then with two fleets, you can change only one fleet at the time, which means, it'll take 14 years to change your 2 fleets with no penalty (by that time, the replacement aircrafts will be already obsolete).
And I'm talking about 2 main fleets with two replacement... Let's not even think what would happen to an airline with 3 main fleets trying to replace all of them (7 years each fleet will mean 21 years with 4th fleet penalty)
(or 7 years with 6th fleet penalty
My suggestion would be to slighly increase the allowable fleets, in order to make fleets transitioning easier. In a long game format, we'll have a lot of fleet transitions, and commonality penalty, should take into account that...