The application of the principles of economics to the dizzyingly complicated aviation and airline industry is a well-established and flourishing area of research and study, and this new four-volume collection in the Routledge Major Works series, Critical Concepts in Economics, meets the need for an authoritative reference work to enable users to make better sense of its voluminous literature. Indeed, the sheer scale of the research output-and the breadth of the field-makes this anthology especially welcome.