We reported that the National Mediation Board implemented rule changes making it easier for unions to organize workers in the rail and airline industries. The Air Transport Association of America trade group did not take the rule-change sitting down and filed suit against the NMB, calling the rule change a violation of law. Other organizations joining the lawsuit include Delta Air Lines Inc, FedEx Corp, AirTran Airways, JetBlue Airways and Alaska Airlines, a unit of Alaska Air Group. The U.S. Chamber of Commerce also joined the fray, filing a motion to intervene as a third-party plaintiff in the Air Transport Association’s suit.