This dissertation investigates relationship marketing within the airline industry, using British Airways as a case study. It explores the concept's background, rationale, aims, objectives, and research questions, alongside a comprehensive literature review covering CRM theories, customer retention, loyalty, and defection. The research methodology outlines the research philosophy, approach, design, data collection methods, sampling, and analysis techniques. The study analyzes data collected through questionnaires to assess the impact of relationship marketing strategies. The dissertation concludes with findings, recommendations, and ethical considerations, offering insights into the significance of relationship marketing for airlines and potential strategies for enhancing customer relationships. The report also highlights the tools and techniques adopted by British Airways for relationship marketing and provides conceptual framework.