Forget the whole on-the-backs-of discussion with regard to pilots.

To really get down to the most extreme example, look no further than this:

Delta to contract out 741 jobs at Detroit Metropolitan Airport | The Detroit News

741 DGS employees at DTW are going to be laid off and re-hired at lower rates again. How many times have they already been through this?

Very sad.

The entire concourse B/C experience at DTW reflects this.