"Once the NMB releases the parties from mediation, however, they retain the power to engage in strikes or lockouts, even if they subsequently resume negotiations or the NMB offers mediation again.
The federal courts likewise have the power to enjoin a union from striking over arbitrable disputes. The court may, on the other hand, also require the employer to restore the status quo as a condition of any injunctive relief against a strike."
I'm not sure why the pilots are negotiating it sounds like they have no recourse. I hope it all works out for them and I guess me in the long run.