The body of legislation governing labor relations in the private sector of the U.S. economy consists of two separate and distinct acts: the Railway Labor Act (RLA), which governs labor relations in the railroad and airline industries, and the National Labor Relations Act (NLRA), which governs labor relations in all other industrial sectors.

Although the NLRA closely follows the pattern established by the RLA, Kaps notes that the two laws are distinguishable in several important areas. Labor contracts negotiated under the RLA continue in perpetuity, for example, whereas all other labor contracts expire at a specified date. Other important areas of difference relate to the collective bargaining process itself, the procedures for the arbitration of disputes and grievances, and the spheres of authority and jurisdiction to consider such matters as unfair labor practices.