Thanks for the information.
My entire point was not about the protest but how they are doing it. I am choosing to fly AA - not be involved in a political debate. The plane is a private space owned by AA (or the bank!) and not a public space for union politics. I hope they could find other ways to express their concerns about AA's finances.
I want to sit back, relax and enjoy my flight - I don't want to be forced to learn about union politics of flight attendant gripes.