The article provides formulas that make it possible to calculate the intensity of the incoming and outgoing flow of passenger demands for transport services by passenger taxi cars in such large transport hubs of the Moscow agglomeration as the airports of the Moscow Aviation Hub, which are typical examples of a queuing system. The main differences between the incoming and outgoing flow are noted. As a result of the fact that the incoming flow is subject to elements of randomness, the article discusses a method for determining the distribution law of a random variable, which is the probability of passengers arriving pi(t) at the airport at time t before the scheduled departure time of the aircraft. Using the standard Pearson’s criterion χ2, the hypothesis about the expected distribution law is tested. The intensities of incoming and outgoing flow calculated according to the above formulas can be used as input data for simulation modeling of the queuing system for passengers at transport hubs by various modes of transport in order to optimize the transportation process and improve the quality of passenger service. Keywords transport hub, urban agglomeration, taxi transportation, queuing system, incoming flow, random variable distribution law, Pearson’s criterion χ2