I don't agree. Now, if you go in demanding "full restoration" on date of signing and refuse to budge, then yeah, you're absolutely right that the NMB won't release you to strike, because Delta can't afford to pay $2 billion in improvements in the first year. But if you go in with something that the company can afford, then it benefits the NMB to provide a release if negotiations don't produce an agreement, because a release will almost certainly lead to a TA, and that clears a high profile case off of the NMB's docket and makes them look like heroes.