Comment by AnthonyMouse

They rehired anyone willing to go back to work. No one was required to lose their livelihood.

The union's problem was that they assumed air traffic control was so important they could dictate terms and then they got called on it and lost. Public sector unions don't really work because the other side of the table is the government (and by extension the public), so the two possible outcomes are that the union gets screwed by the government or the public gets screwed by the union.