I think we all know an actual Section 6 self-help "strike" is never going to happen.
The NMB won't allow it.

However-
If we don't have a contract by this summer then we are going to start looking for legal ways to put economic pressure on the corporation. There are many options. We will not violate the RLA status quo but customers are absolutely going to see and be affected by this labor dispute and yes, the company's profits will be reduced.

Economic pressure. Same concept as a strike except on a smaller scale.
I hope you will be on board if and when that becomes necessary.