There a number of differences.
First, the atc's went on strike. It was not an issue of demanding that they give up collective bargaining rights.
Second, there are far fewer atc's than there are teachers.
Third, the atc's didn't shut down a branch of the government over a particular piece of legislation.
I understand that the GOP wants to invoke the specter of Reagan firing the atc's for being unreasonable, but its a very weak comparison and the effort so far to try to cast this governor as Reaganesque has not really gained a lot of traction with anyone other than those would support him, anyway.
Without the ability to go on strike, collective bargaining units have no power. Everyone knows what the threat of collective bargaining is, give us a contract we like and will agree to or we will walk.