This report is commissioned by the Swedish Civil Aviation Authority. The aim is to update the knowledge regarding the price relevant costs of aviation. We distinguish between marginal costs caused by airport activities and those caused by the external effects of pollution and noise. The review shows that vital data is missing regarding the activities and effects of aviation in order to perform solid marginal cost calculations. In the report we have calculated approximative values for two types of airplanes. Marginal costs related to airport services are divided into those related to passenger services and those related to congestion services. We conclude that the Swedish charges are at least twice as high as marginal costs. We do, however, lack any estimation of the congestion-related marginal costs. Regarding the external effects, today's charges concerning the landing and take-off cycle are sufficient although partly mischarged since they only reflect NOx-emissions. Moreover it should be examined if emissions during flying should be charged or not. The conclusion of this report is that more research is needed in this area. This concerns studies dealing with Swedish airports as well as making cost data publicly available.