Flight Attendant Unions are part of being a airline flight attendant.
Flight attendants are required to join a union. There are more than one union representing flight attendants in the United States. Two of the unions are Association of Professional Flight Attendants APFA and Association of Flight Attendants AFA - CWA. Flight attendants pay a union fee each month to be a member of the union association.
The union is there to represent the flight attendants and to negotiate contracts, wages, benefits as well as working conditions. Every few years, a new flight attendant contract is negotiated by the union on behalf of all flight attendants working for each airline. Usually, at the end of the negotiations with the airline, a new contract is created and it may include new salary and benefits.