The air travel industry, a major contributor to greenhouse gas emissions, has increasingly prioritized environmental concerns in its operations and marketing efforts. This chapter examines the factors influencing green purchase intentions among passengers of airlines travel industry using the Necessary Condition Analysis (NCA) approach. Data was collected from 221 Algerian passengers via a structured questionnaire. The findings reveal that green perceived value, environmental concern, environmental knowledge, and environmental attitude are all crucial in shaping green purchasing intentions in the airline sector. These insights are valuable for managers aiming to develop marketing strategies that effectively stimulate green purchase intentions in the airline industry. Academically, this chapter offers a robust methodology through necessity logic to explore consumer behavior with greater accuracy.