Being an air line pilot is a crazy amalgamation of blue and white collar. Most people would consider our actual job itself to be "white collar," because we are supervisors, highly trained and educated, hold very high levels of responsibility, etc..., however, we are also clearly a labor group. We've handled this over the years by going at unionization at a different angle.
In order to uphold our very high levels of pay and QOL, it's necessary for us to maintain a white-collar image. This means that we have to deal with management and the government on their level. This is why you see ALPA reps wearing business suits when dealing with management and politicians. It's simply part of playing the game. Likewise, appearing as a consummate professional while on the job is also part of the game. This is why the ALPA Code of Ethics spends so much time talking about our behavior on the job, and not just our behavior in the union hall, so to speak. Our outward image to the flying public, to the media, and to management is extremely important in trying to play this balancing act of blue/white collar.