There are very few airlines left that are not "union shops". So if you take a job with such a company, you should realize that you are expected to either join the union membership, or decline membership but still pay the union dues. If you don't feel like the unions are helpful and there for a reason, I would recommend looking elsewhere for employment. That way, in case there should ever be a strike at that airline that you don't support the union on, you won't be faced with the life-long consequences of having scabbed during the strike. Just remember that when you accept a new job somewhere that you are accepting all that comes along with it. And in this day and age, that means the union part of it as well.
I'm of the opinion that if the Union was there before you got at job at xyz airline, then you support the union actions when they occur or find another job.
If you were there before the Union, then you might have more of a leg to stand on in opposing union actions.
And as far as the screen actors guild goes, do you think that when Alec Baldwin cashed his last check for making Pearl Harbor, that he felt guilty and gave an extra piece of that money back to the camera-men, seconds, make-up, editors, etc. Most of those actors in Hollywood care more about what ribbon they are going to wear on their lapel this week than some starving camera guy.
That whole issue is apples and oranges compared to the airlines. Does Hollywood have to comply with the RLA? They can tiger strike/sick out whenever they want. Seems to me people like Tiger and Brittany actually have created jobs for many individuals, not taken them away. And I also suppose that all those staunch supporters of the guild boycotted television and movies for the duration of the strike right? I don't really expect anyone outside the airline industry to give a rat's posterior about our unions/ strikes/ etc., except when it affects them directly. I seriously doubt if the cameramen on the set of some movie spends his lunch hour pondering how he feels about the airlines labor problems. And finally, the biggest contrast between the two is that the ONLY LEGAL bargaining power an airline union has is threat of a strike, thanks to the shackles of the RLA.
(1900laker steps down from the soapbox)