That's not true. Injunctions can actually be very easy to get... it depends on the political climate and the attitude of the judge. Ask your fellow Delta pilots about the 2000 negotiations and voluntary green slips. The purpose of an injunction is to stop a arty from taking action before the court decides.
This injunction was placed because Mesa was posturing to file bankruptcy if something wasn't done. Effectively, irreparable harm would have occurred to Mesa before the facts of the case were even argued in court. In light of this, no competent judge would have allowed such, because overruling this injunction would have decided the case before it even began.
All this injunction means is that status quo must prevail until the trial. Nothing more, nothing less. I predict it doesn't go to trial, though. Delta will settle with Mesa for $0.50 on the dollar for the contract with the stipulation that Mesa goes away.
