Originally Posted by xfzz

I shouldn't say "violations". I meant "exceptions", as you pointed out. What I was trying to do is to have a mathematical model that can produce a crew schedule, that is as close to real-world-feasibility as possible. Because the real world rules are complicated, and the model can't handle them all together. One way to do it is to use some rules in the model, and then manually modify the produced schedule to make sure other rules. The subject is the fractional program (only fractional, no charter). So I try to understand all rules first, and then put a set of rules into the model such that, the model will produce a schedule that requires the minimum manual adjustment afterwards. It's not like to try not to follow the rules or break the law or anything like that. I should say this in my first post, but just too lazy to type all that. In any case, all your feedbacks are greatly appreciated.