In the event of a change of service provider, Member States must ensure that air service personnel are transferred to the new provider and that collective agreements are respected. Officially, the company is subject to a collective agreement that imposes on average the duration of contract work at a maximum of twelve months. In the United States, the National Labor Relations Act (1935) covers most collective agreements in the private sector. The Act makes it illegal for employers to discriminate, spy, harass or terminate workers because of their union membership or to retaliate for organizing campaigns or other “concerted activities,” creating business unions or refusing to engage in collective bargaining with the union that represents their employees. It is also illegal to require any worker to join a union as a condition of employment.  Trade unions are also able to ensure safe working conditions and adequate remuneration for their work. The term “collective bargaining” was first used in 1891 by Beatrice Webb, founder of the INDUSTRIAL relations sector in the United Kingdom.  It refers to the type of collective bargaining and agreements that have existed since the rise of trade unions in the 18th century. In all these countries, the minimum rates of the law can be supplemented by minimum rates set in collective agreements, although the level and coverage of these agreements are different, as is the ratio between the minimum rates they set and the national minimum. The American Federation of Labor was founded in 1886 and provided a large number of workers with unprecedented bargaining power.
 The Railway Labor Act (1926) required employers to bargain collectively with unions. The Office of Labor Management Standards, part of the U.S. Department of Labor, is required to collect all collective agreements for 1,000 or more workers, with the exception of those involving railroads and airlines.  They offer the public access to these collections through their website. Collective agreement for the promotion of employment and competitiveness of the German textile and clothing industry of 12 October 2004 Art. Diese langfristige Abfertigungsvereinbarung mit Lufthansa und die erfolgreiche Inbetriebnahme von AeroGround sind fer die FMG ein wichtiger Meilenstein auf dem Weg zur Restrukturierung ihrer Bodendienstleistungsaktiviten.