In the early 1950s the airport was served by the original Frontier Airlines (1950-1986) which flew DC-3's on a route from El Paso to Phoenix that included stops at Las Cruces, Deming, and Lordsburg, NM as well as Clifton, Safford, and Tucson, AZ.
A protected group is a group of people qualified for special protection by a law, policy, or similar authority. In the United States, the term is frequently used in connection with employees and employment.
To be considered protected under the NLRA, the activity by two or more employees (or one employee acting on behalf of a group) must be engaged in for employees' mutual aid or protection, such as activity to improve working conditions or to bring truly group complaints to the attention of management or the National Labor Relations Board.