At the moment I can think of at least one unit that'd come to a rapid and grinding halt if the ATSAs undertook an overtime ban.
But then, they'd also have to give up their early go's and extended breaks in order to work to rule. And I sense, amongst some of them, they wouldn't be willing to do any of those three things.
ATSAs - you really need to help yourselves and act whilst what little powder you have left is dry.....