> That doesn’t seem very reasonable for jobs where the supply of labor is high compared to demand

Why would you think that's the case? Boeing's jobs pay barely above minimum wage for shitty work hours and long training in far away factories. They have a lack of thousands of mechanics, machinists, engineers, etc.

Also, the workers were screwed out last time there were negotiations because Boeing threatened to move production to non-union states. They're trying to partially compensate for that tol.