A new rule change announced by the National Mediation Board will make it easier for airline and railroad unions to organize. The new rule recognizes a union if the majority of workers who vote, vote for the union. The old rule needed a majority of all eligible workers to vote for the union, with those who did not vote being counted as "no" votes. The new rule brings guidelines for elections closer to those enforced by the National Labor Relations Board. Airlines have vigorously opposed the rule, citing everything from higher fuel costs to security measures as reasons for not changing the rule. The Air Transport Association is expected to file a lawsuit, a move that Delta, which is facing an immediate election for flight attendants once the rule is in effect, says that it will support.