The Contract stays in force until we come to an agreement with the company or we are released from mediation and each side can engage in 'self help". At that time the company can implement their last offer and we can go on strike.
Look for the company to announce our future fleet plan (ie: loss of aircraft) well before we start negotiations. That way, they will not have to be concerned with violating "status quo" as Delta reduces our fleet while in negotiations.
Also, Remember the Fleet Guarantee letter of agreement expires shortly after the first of the year.