Affirmed on the authority of International Association of Machinists, AFL-CIO v. Central Airlines, Inc., 372 U.S. 682, 83 S.Ct. 956, 10 L.Ed.2d 67 (1963) and Andrews v. Louisville & Nashville Railroad Company, 406 U.S. 320, 92 S.Ct. 1562, 32 L.Ed.2d 95 (1972).