first of all.. 26-28th is NOT necessarily the end of negotiations.
the Union has submitted a proffer of binding arbitration to the NBM... the MEDIATOR is allowed to submit his thoughts to the NMB.. the MEDIATOR does not make these decisions.. the three person NMB panel will decide to accept or deny the proffer.
IF the proffer is accepted one.. or both parties will reject binding arbitration thus starting the 30 day cooling off period. During this time the NMB very likely will require SUPER mediation which is basically all day every day negotiations during this period until they feel there is not further use in negotiations. At the end of the 30 day period... both parties are free to use Self Help measures, i.e. the union can strike.. or choose other work actions. The company can also arbitrarily change pay rates and work rules.....
IF the proffer is rejected, likely they would table negotiations for a short period of time.. or maybe not. And then continue on the same path we have been on... months 3 day negotiation sessions until some point in the future.
IF you happen to be on a rotation at the point a legal strike was called, the union has measures to return all crew members to their home.