This thesis investigates strategic alliances in the aviation industry, focusing on resource sharing, using Scandinavian Airlines (SAS) within Star Alliance and SkyTeam as case studies. It examines the operational and competitive benefits of these collaborations through qualitative research, including interviews with executives and experts. The study highlights alliance dynamics like antitrust immunity, code sharing, and the resource-based view. Findings show alliances improve operational efficiency, competitive positioning, and customer service. It also considers the impact of new technologies and global events on alliances, which pool tangible (technology, infrastructure) and intangible assets (brand reputation, identity), fostering deeper integration. This research enhances understanding of strategic drivers in airline alliances and the complexities of resource sharing in the global aviation sector.