Nos. 86-2520, 86-2530

865 F.2d 1112 111 Lab.Cas. P 56,050 AIR CAL, INC.; Air Canada; Alaska Airlines, Inc.; American Airlines, Inc.; Braniff, Inc.; Canadian Pacific Air Lines, Inc.; Continental Air Lines, Inc.; Delta Air Lines, Inc.; Eastern Airlines, Inc.; Evergreen International Air Lines, Inc.; Frontier Airlines, Inc.; Northwest Airlines, Inc.; Pacific Southwest Airlines, Inc.; Pan American World Airways, Inc.; Piedmont Aviation, Inc.; World Airlines, Inc.; United Air Lines, Inc.; USAir, Inc.; and Western Air Lines, Inc., Plaintiffs-Appellees, CITY AND COUNTY OF SAN FRANCISCO, a municipal corporation; the Airports Commission of the City and County of San Francisco; Civil Service Commission of the City and County of San Francisco, Defendants-Appellants, San Mateo Central Labor Council; SFO Airport Labor Coalition, Defendant- Intervenors-Appellants, and San Francisco Labor Council; SEIU Local 87; SEIU Local 77, Defendants- Intervenors. Nos. 86-2520, 86-2530. United States Court of Appeals, Ninth Circuit. Argued and Submitted Dec. 15, 1987. Decided Jan. 17, 1989. Louise H. Renne, City Atty., Burk E. Delventhal and Judith A. Boyajian, Deputy City Attys., San Francisco, Cal., for defendants-appellants.…