This study examines maintaining the traditional services of full-service network carriers and creating new, supplementary products to sell in addition to the airline tickets and thereby gain additional ancillary revenues. The goal of this study is to determine viability and customer value of purchasable supplementary services for economy class passengers of European full-service network carriers. The focus of the study lies in determining specific characteristics of the customer value concept in the context of purchasable supplementary services. Additionally, knowledge about the unbundling of existing services, the introduction of new additional services, and the packaging of purchasable supplementary services is gained, in order to determine the feasibility of implementing such measures. The following research questions are answered by this study: