In this paper, we calculated the hourly single runway saturation capacity (the maximum throughput capacity of the runway) of New Tokyo International Airport, Tokyo International Airport and Kansai International Airport with a simple analytical method and analyzed the effect of some parameters on the runway capacity, including the aircraft mix, the final approach length and the buffer used in air traffic control. It was found that among the characteristics of these airports, both the high ratio of heavy aircraft and the long final approach path do not have strong negative effects on the single runway capacity because the aircraft mix at these airports has a high homogeneity. The factors which have relatively strong effect on the capacity are the time buffer and the required distance between the threshold and the arrival aircraft on the final approach when the leading aircraft clears the runway.
