Dude, I would be up for it but I'm too poor to pay the dues...that's how they get ya!
I have this day dream of being at our monthly CFI meeting with the bosses, we are going to put the brakes on the meeting pull out a gavel and jokingly vote in Union and a Union president and other items. I would love to see the reaction.
It would be funny, if we wouldn't all be fired before the joke fell.

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I honestly feel like I get a fair shake at my shop.
I think I get a just slightly below a fair % of the money I bring in with an hour of work. I know the boss is not paying me so little because they want more for themselves, but its because they have very little.
Now I worked at a different place that I saw a very small % of what was charged for an hour of my time. The only thing you can do there is quit. I did.
I personally think the answer is to charge more, which is only accomplishable if you go independent. IMO. If my school charged more we wouldn't be competitive to the other schools in the area.
It's a tough go to have a flight school, but if I worked at a place that I felt had the money and was holding out, I too would be all for a union.
My last pay check was $350
My one before that was a record high $1300