On June 29, 2011 AFA won one of the largest private sector union elections in decades, winning representation rights for the combined workforce of approximately 24,000 flight attendants at United Airlines, Continental Airlines and Continental Micronesia. That election was triggered by a National Mediation Board ruling that those airlines had formed a single transportation system as a result of a corporate merger. The International Association of Machinists and Aerospace Workers filed objections to the election. Those objections are pending before the National Mediation Board. Negotiations for a single, combined collective bargaining agreement were ongoing as of June 1, 2014.