They may or may not be added, but seats keep appearing and disappearing due to another effect: There is no penalty for changing dates on award tickets. So people will do it for good and bad reasons, often on a whim, often more than once. So you need to keep checking. However, Feb is far way, there are lots of flights between LAX and ORD, and there is very little doubt that if you keep checking you'll find something. Similarly, you can probably switch to a better outbound flight too.