Originally Posted by MARX

It is enforceable, it has been enforced successfully, CPZ would and already has. You're career progression isn't the concern of your current employer–they're not your guidance counselor. It's a contract, and contracts are enforceable. If you need proof, reference some of the high profile cases involving musicians, actors, and pro athletes.

Having said that, regionals know they're a stepping stone, and that their pilots will move on someday, but not inside of a year.