The pilot might not want to at all. In this example a freight company with a non-unionized labor group is saying "we have a flight tomorrow from KXXX to KYYY and your show time is 1200". Can that pilot refuse the flight because it's struck work by someone else and be legally protected or would it be termination for him? I'm not commenting on the validity of a union I fully understand why they're needed I'm just asking this because honestly I don't know the answer and there are a few non-union carriers out there, both 135 and 121, that could make the matter much more difficult.