Optimiezed way to move schedules

Is there pilots-optimized way to move schedules?

E.g. moving 737 classic to 737 NG (excluding slots issues), my concern is if I assign pilots to the new plane I will have redundant staff at the end. I know I could do it plane by plane to minimize redundancy (8 pilots per plane), but what about if I need to move 15 planes? Will I be left over with 120 redundant pilots at the end?

In RL, pilots would just start flying on the new plane after the old one is retired/stored. Why cannot we have something similar in AS?

Any optimal way to deal with this issue?

737 classic to 737 NG requires minimum a conversion course for 2 days classroom, maybe 3 Simulators plus a check ... plus line training ..... so all in all a lot of training and pilots not beeing profitable for at least 1,5 weeks. Thats of course is RL. Here in the Game you can keep them and train them also on another type or you have to minimize costs and change plane by plane .... 

Hi George,

you need a minimum of three crews.

I am currently replacing my 320's by the enhanced version, and I have hired 5 extra crews (40 pilots plus cabin crew). When I am finished, I shall lease or buy a few extra planes and keep most of the staff. And yes, I shall fire those that I don't need. It's not something that kills an airline  ;-)

Have a nice weekend,

Jan