David Walsh examines the historically insular unions in the airline industry, where the need for cooperation has been heightened in the era since deregulation. Guided by organizational theory, he analyzes extensive data on pairs of unions, coalitions, and the airline union network as a whole, finding a complex web of connections. Drawing on quantitative data from his network analysis, on the historical background, and on descriptive case studies, including the Eastern Airlines strike, Walsh identifies the possibilities and the limitations of labor solidarity.