While I am no fan of unions, I agree with 3Cforme's point, the agreement is bilaterial. AA agreed to this term to its detriment, just like GM voluntarily agreed to all of the company-destroying concessions to its unions. It's a two way street.

Perhaps your point, STS, is that collective bargaining should not be permitted (as restraint of trade), which is an interesting and perhaps persuasive argument to make, especially in an industry with several competitors.