Today, the AFL-CIO, the Association of Flight Attendants-CWA (AFA-CWA), the Air Line Pilots Association (ALPA), the International Association of Machinists and Aerospace Workers (IAM) and United Airlines teamed up to fly more than 300 first responders and skilled volunteers—including nurses, doctors, electricians, engineers, carpenters and truck drivers—to Puerto Rico to help with relief and rebuilding efforts.