Who's been filling your mind with such nonsense? The NMB will park negotiations if they feel one side or both is unwilling to negotiate. The company always retains the right to lock out employees at the end of 30 day cooling off (refer back to the "parking comment - i.e. you'll never get out of benig parked to get to the 30 day cooling off) and labor retains the right to strike. However, the union needs to have a strike vote and the brain trust in CLT won't get enough Yes votes to a) influencing the company to resume good-faith negotiations and B) actually pull off a successful strike if one would actually be called.
The pace of negotiations would increase if either USAPA was replaced with an organization that had the respect and solidarity of its members or if the courts decide that the Nic list is the only list to be used for integration (USAPA could try re-ordering the list at the next contract, right?) thus defusing the vindictive nature of USAPA and their anti-west bias.
Either way it's unity first, contract second.