YRCW's survival is now clearly in the hands of its Teamsters. If they are selfish enough to demand a higher interest rate on their deferred pension contributions, the company will fail and they will get little or nothing.
Teamsters, think hard about what you're about to do to yourselves. Think very, very carefully about the imminent consequences of your greed and inability to think long-term. The survival of your employer depends entirely on whether you're not collectively stupid enough to demand something you have no hope of receiving.
Full disclosure: No position in YRCW at all. Ever.