Introduction: This chapter will focus upon the concepts of service quality, satisfaction and loyalty in the context of airline services. Therefore, the main classification schemes of service quality and the location of airline services in these classifications will be clarified. Then the literature of previous studies that have discussed the dimensions of airline service quality will be reviewed; this will help to identify the important factors that can be used to measure service quality. In the fourth part, a review of different studies that discuss the concepts of passenger satisfaction and loyalty will be highlighted to explain the relationship between these concepts and service quality. Then a theoretical linkage between the three concepts will be reviewed. The various aspects that relate to travel behaviour will be discussed to give a clear idea about passenger behaviour and what are those factors, that may affect their travel decisions. Finally, the role of employees in airline services will be discussed to examine how they perceive the level of services they provide to passengers and why different gaps may exist between employee perception and passenger expectations of these services.