zubenelgenubi
I'm a star
Sure, the union is allowed to call for a strike without bringing it back to a vote. But the current union is fighting so hard for a yes vote right now and telling us how great the contract is, for them to respond to a No vote by immediately calling a strike right before peak would be completely out of left field. The only way I could see that happening is if they hated this contract all along and was secretly behind the vote no movement, but publically they had to fight for this contract. And even then I'm pretty sure they would try and renegotiate before calling for a strike.
Everyone should still be prepared for a strike just in case, whether they're voting yes or no, but there's just no way this union calls for a strike without being forced to. Most likely they'll be looking for loopholes just like last time to force the contract through on the locals holding out.
That was one idea I was entertaining as a means of giving the union the benefit of the doubt. A lot of people expressed their extreme disbelief in the idea. I don't think it's impossible.